Adler32 string transform implementation

[stevendborrelli]

Description of your changes

Adds an Adler-32 checksum, this is used with some Let's Encrypt configurations.

Testing:

I tested the hashing using the following Python script, these values matched the values generated by the transform.

python3
Python 3.11.2 (main, Feb 16 2023, 02:51:42) [Clang 14.0.0 (clang-1400.0.29.202)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
>>> import zlib
>>> zlib.adler32("⡌⠁⠧⠑ ⠼⠁⠒  ⡍⠜⠇⠑⠹⠰⠎ ⡣⠕⠌".encode('utf-8'))
4110427190
>>> zlib.adler32(b'Crossplane')
373097499
>>> 

I have:

• Read and followed Crossplane's contribution process.
• Added or updated unit and E2E tests for my change.
• Run make reviewable to ensure this PR is ready for review.
• Added backport release-x.y labels to auto-backport this PR if necessary.
• Opened a PR updating the docs, if necessary. add doc for adler32 transform docs#524

[phisco]

is this the right value once we get #4445 merged?

[stevendborrelli]

I need to update it to the correct value after rebasing on #4445.

[pedjak]

It would be nice to update the docs as well, pushing a PR against https://github.com/crossplane/docs/

[phisco]

Looks like there are conflicts, @stevendborrelli, could you rebase and address the comment from @pedjak about the doc, we actually added a check to the PRs checklist for that now too 🙏

[stevendborrelli]

Pull request has been rebased off of #4445 and the test hashes have been updated to correct values.

[stevendborrelli]

Docs PR created: crossplane/docs#524