feat: add binary data type support to bwrite command

[tmyoda]

Issue #, if available:
#168

Description of changes:
This PR adds support for Binary data types (B, BS) tobwrite command.

By submitting this pull request, I confirm that you can use, modify, copy, and redistribute this contribution, under the terms of your choice.

[StoneDot]

Thank you for implementing the support of the binary data type in the bwrite command. This is a great addition!

I had doubts about whether base64 decoding was required to put the correct items. After conducting my investigation, it seems that the current implementation is indeed correct, and there's no need for base64 decoding. If the tests validate this, that's excellent. Would it be possible for you to include a test case to verify this?

Please let me know if you intend to address this in a separate pull request.

[tmyoda]

Thank you for the review!
I've added an integration test to verify that the current implementation works correctly without the need for base64 encoding.

Please let me know if there's anything else you'd like me to address.

[StoneDot]

Based on the test codes, the binary data seems double-encoded by base64. My check was something wrong. Could you please fix this?

[StoneDot]

Based on my testing, I confirmed that dy get -o raw is correct.

❯ cargo run bwrite --input tests/resources/test_batch_write.json                                                               
❯ cargo run get ichi -o raw
    Finished dev [unoptimized + debuginfo] target(s) in 0.22s
     Running `target/debug/dy get ichi -o raw`
{
  "BinarySet": {
    "BS": [
      "VTI1dmQzaz0=",
      "VTNWdWJuaz0=",
      "VW1GcGJuaz0="
    ]
  },
  "Nothing": {
    "NULL": true
  },
  "PageCount": {
    "NS": [
      "-19",
      "3.14",
      "7.5",
      "42.2"
    ]
  },
  "ISBN": {
    "S": "111-1111111111"
  },
  "Dimensions": {
    "SS": [
      "Giraffe",
      "Hippo",
      "Zebra"
    ]
  },
  "Binary": {
    "B": "ZEdocGN5QjBaWGgwSUdseklHSmhjMlUyTkMxbGJtTnZaR1Zr"
  },
  "Details": {
    "M": {
      "Age": {
        "N": "35"
      },
      "Misc": {
        "M": {
          "dream": {
            "L": [
              {
                "N": "35"
              },
              {
                "NULL": true
              }
            ]
          },
          "hope": {
            "BOOL": true
          }
        }
      },
      "Name": {
        "S": "Joe"
      }
    }
  },
  "InPublication": {
    "BOOL": false
  },
  "Price": {
    "N": "2"
  },
  "pk": {
    "S": "ichi"
  },
  "Authors": {
    "L": [
      {
        "S": "Author1"
      },
      {
        "S": "Author2"
      },
      {
        "N": "42"
      }
    ]
  }
}
❯ aws dynamodb get-item --endpoint http://localhost:8000 --region local --table-name __TABLE_NAME__ --key '{"pk":{"S":"ichi"}}'
{
    "Item": {
        "InPublication": {
            "BOOL": false
        },
        "Details": {
            "M": {
                "Misc": {
                    "M": {
                        "hope": {
                            "BOOL": true
                        },
                        "dream": {
                            "L": [
                                {
                                    "N": "35"
                                },
                                {
                                    "NULL": true
                                }
                            ]
                        }
                    }
                },
                "Age": {
                    "N": "35"
                },
                "Name": {
                    "S": "Joe"
                }
            }
        },
        "BinarySet": {
            "BS": [
                "VTI1dmQzaz0=",
                "VTNWdWJuaz0=",
                "VW1GcGJuaz0="
            ]
        },
        "PageCount": {
            "NS": [
                "-19",
                "3.14",
                "7.5",
                "42.2"
            ]
        },
        "ISBN": {
            "S": "111-1111111111"
        },
        "Price": {
            "N": "2"
        },
        "Authors": {
            "L": [
                {
                    "S": "Author1"
                },
                {
                    "S": "Author2"
                },
                {
                    "N": "42"
                }
            ]
        },
        "Dimensions": {
            "SS": [
                "Giraffe",
                "Hippo",
                "Zebra"
            ]
        },
        "pk": {
            "S": "ichi"
        },
        "Binary": {
            "B": "ZEdocGN5QjBaWGgwSUdseklHSmhjMlUyTkMxbGJtTnZaR1Zr"
        },
        "Nothing": {
            "NULL": true
        }
    }
}

[tmyoda]

Thank you again for your review.

I apologize for the misunderstanding. I initially believed that your request was to check if the input is always encoded once.

Based on my investigation, it appears that rusoto_dynamodb::DynamoDbClient's batch_write_item encodes the input to base64.

https://rusoto.github.io/rusoto/src/rusoto_dynamodb/generated.rs.html#4714-4740

As you suggested, I will decode the input data before calling batch_write_item.

[StoneDot]

Thank you for your modification.
I apologize for the repeated request, but could you check my comments? I think that there is some room for improvement to this pull request to become a more great one.

[tmyoda]

Thank you so much for your thorough review! I have implemented the changes and left a comment.

[StoneDot]

LGTM. Thank you!