[HUDI-8401] Add merger class LegacyMySqlDebeziumAvroMerger

[linliu-code]

Change Logs

This change adds the merger class to deprecate MySqlDebeziumAvroPayload.

Impact

MySqlDebeziumAvroPayload is not initialized in Hudi.

Risk level (write none, low medium or high below)

Low.

Documentation Update

Describe any necessary documentation update if there is any new feature, config, or user-facing change. If not, put "none".

• The config description must be updated if new configs are added or the default value of the configs are changed
• Any new feature or user-facing change requires updating the Hudi website. Please create a Jira ticket, attach the ticket number here and follow the instruction to make changes to the website.

Contributor's checklist

• [ ] Read through contributor's guide
• [ ] Change Logs and Impact were stated clearly
• [ ] Adequate tests were added if applicable
• [ ] CI passed

[hudi-bot]

CI report:

• 210e0267e049d59e13412dc3c79a433aa1fdb980 UNKNOWN
• a3217cd6b3a3661c008c1d4f193086b96bba344c UNKNOWN
• 5ce3c4bf92ec953649dc24055a18863491bc7379 UNKNOWN
• a9edfb2a02b0f2b0f92ecaaef4ef240b5ec83db9 UNKNOWN
• b55d3997aec63ce0030454384ffee8d73409a00b Azure: FAILURE

Bot commands

@hudi-bot supports the following commands:

• @hudi-bot run azure re-run the last Azure build