fix(mysql-cdc): enable heartbeat message to keep the offset up to date with upstream

[StrikeW]

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What's changed and what's your intention?

Enable Debezium to emit heartbeat message which contains a binlog offset for each heartbeat.interval.ms, so that the persisted source offset can be updated even though the upstream table doesn't have any update for a long time.

Tested locally.

related: #12753

Checklist

• I have written necessary rustdoc comments
• I have added necessary unit tests and integration tests
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[codecov]

Codecov Report

Merging #12868 (2da7790) into main (5d97d60) will increase coverage by 0.11%.
Report is 9 commits behind head on main.
The diff coverage is 89.42%.

@@            Coverage Diff             @@
##             main   #12868      +/-   ##
==========================================
+ Coverage   69.14%   69.25%   +0.11%     
==========================================
  Files        1487     1489       +2     
  Lines      244648   245828    +1180     
==========================================
+ Hits       169150   170246    +1096     
- Misses      75498    75582      +84     

Flag	Coverage Δ
rust	69.25% <89.42%> (+0.11%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files	Coverage Δ
src/connector/src/lib.rs	52.08% <ø> (ø)
src/connector/src/sink/encoder/json.rs	84.63% <100.00%> (ø)
src/connector/src/sink/mod.rs	62.04% <ø> (+0.72%)	⬆️
src/connector/src/source/external.rs	34.96% <100.00%> (ø)
src/expr/core/src/aggregate/def.rs	69.66% <ø> (ø)
.../frontend/src/optimizer/plan_node/generic/union.rs	100.00% <100.00%> (ø)
.../frontend/src/optimizer/plan_node/logical_union.rs	97.09% <100.00%> (+0.17%)	⬆️
src/stream/src/executor/aggregation/minput.rs	97.53% <100.00%> (ø)
src/common/src/monitor/connection.rs	58.53% <50.00%> (ø)
src/connector/src/sink/encoder/mod.rs	73.68% <95.83%> (+37.96%)	⬆️
... and 17 more

... and 17 files with indirect coverage changes

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[BugenZhao]

I guess this should apply to all kinds of messages that have empty keys and payloads? 🤔

[StrikeW]

I expect this patch only affect direct cdc use cases, because I am not sure when it would break other connectors.