Add a tool to parse and print relay log content

[csuzhangxc]

What problem does this PR solve?

add a tool (relayprinter) to parse and print relay log content

What is changed and how it works?

• use binlogfile.OpenBinlogger to read binlog entities

some samples of output:

# at suffix:68 offset:309213
# commitTS:420762958799568899
# schema:db2 table:account_verify
create table account_verify(
    account_id bigint(19) unsigned NOT NULL primary key,
    currency int(3) unsigned NOT NULL,
    verify_date date NOT NULL,
    wrong_amount bigint(17) NOT NULL
)

# at suffix:68 offset:312343
# commitTS:420762964697808903
# schema: db2 table:institution
# INSERET
# values: map[name:institution 9 status:0 uid:9]
INSERT INTO `db2`.`institution`
  (`name`,`status`,`uid`)
VALUES
  (institution 9,0,9)

# schema: db2 table:account_number
# UPDATE
# old alues: map[account:5160 currency:1 number:3 number_type:2 update_time:2020-11-10]
# new values: map[account:5160 currency:1 number:4 number_type:2 update_time:2020-11-10]
UPDATE `db2`.`account_number` SET
  `account` = 5160,
  `currency` = 1,
  `number` = 4,
  `number_type` = 2,
  `update_time` = 2020-11-10
WHERE
  `account` = 5160 AND
  `currency` = 1 AND
  `number` = 3 AND
  `number_type` = 2 AND
  `update_time` = 2020-11-10

# at suffix:68 offset:313484
# commitTS:420762965169668098
# schema: db2 table:employee
# DELETE
# values: map[institution_id:1 status:0 uid:1000000006]
DELETE FROM `db2`.`employee` WHERE
  `institution_id` = 1 AND
  `status` = 0 AND
  `uid` = 1000000006

Check List

Tests

• Manual test (add detailed scripts or steps below)

Code changes

• Has exported function/method change
• Has interface methods change

Side effects

Release note

• No Release note.

[csuzhangxc]

/run-all-tests tidb=release-4.0 tikv=release-4.0 pd=release-4.0

[ti-chi-bot]

@csuzhangxc: PR needs rebase.

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[CLAassistant]

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1 out of 2 committers have signed the CLA.

✅ lichunzhu
❌ csuzhangxc
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