[improve][io] Debezium sources: Support loading config from secrets

[alpreu]

Motivation

Currently the Debezium sources don't support loading sensitive configuration from secrets.

Modifications

Most sources can rely on IOConfigUtils.loadWithSecrets because they provide a specific Config class with FieldDoc annotations. The Debezium sources work differently because there is no specific Config class but rather just a Map with some basic validation that is passed to Debezium. Therefore we need to directly get the secrets from the sourceContext.

Most of the Debezium sources rely on the same config properties (database.user, database.password) to configure the connector so I decided to move the secret-handling code into the abstract DebeziumSource class that all the individual connectors inherit from. There are exceptions to this, such as the MongoDB source, which uses another set of config properties (e.g. mongodb.user instead of database.user), these sources will have to call the secret-handling code by overriding the open method.

Verifying this change

• Make sure that the change passes the CI checks.

This change is a trivial rework / code cleanup without any test coverage.

I would be open to adding a unit test as well, but I feel it does not add a lot of value because the sourceContext already has unit tests for this functionality.

Does this pull request potentially affect one of the following parts:

If the box was checked, please highlight the changes

• Dependencies (add or upgrade a dependency)
• The public API
• The schema
• The default values of configurations
• The threading model
• The binary protocol
• The REST endpoints
• The admin CLI options
• The metrics
• Anything that affects deployment

Documentation

• doc
• doc-required
• doc-not-needed
• doc-complete

Matching PR in forked repository

PR in forked repository: alpreu#4

[nicoloboschi]

/pulsarbot rerun-failure-checks

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 46.91%. Comparing base (feb3cb4) to head (9d5a50c).
⚠️ Report is 3098 commits behind head on master.

Additional details and impacted files

@@             Coverage Diff              @@
##             master   #19004      +/-   ##
============================================
+ Coverage     46.35%   46.91%   +0.55%     
- Complexity     8939    10548    +1609     
============================================
  Files           597      709     +112     
  Lines         56858    69363   +12505     
  Branches       5905     7441    +1536     
============================================
+ Hits          26357    32542    +6185     
- Misses        27616    33165    +5549     
- Partials       2885     3656     +771     

Flag	Coverage Δ
unittests	46.91% <ø> (+0.55%)	⬆️

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see 169 files with indirect coverage changes

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