feat: Allow for returning post commit hooks from transactions

[nicklan]

What changes are proposed in this pull request?

Small pre-factor that includes a Vec of PostCommitActions when returning a Committed result from a Transaction.

Each action is just an enum where each variant has enough info for the engine to perform the requested action. Engines are expected to use existing APIs to perform these actions.

This PR affects the following public APIs

Transaction::commit: Now the Committed variant includes a Vec of actions.

How was this change tested?

No actual functionality. That it compiles is enough.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 84.69%. Comparing base (60d0944) to head (2f1a5fe).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #996   +/-   ##
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  Coverage   84.68%   84.69%           
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  Files          92       92           
  Lines       23015    23018    +3     
  Branches    23015    23018    +3     
=======================================
+ Hits        19491    19494    +3     
  Misses       2563     2563           
  Partials      961      961           

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[roeap]

Overall looks good - clean and simple!

I do believe we may have to consider the current checkpointing API which could also show up as a post commit hook? At least I believe kernel should inform the engine that its time to do a checkpoint based on table settings.

There we ask engine to write a data iterator to a given file. The iterator does collect some stats, so we need to hand it back to kernel to finalise the checkpoint.

This could be hidden behind this API if we introduce a method write_parquet similar to write_json and ask engine to give us that iterator back in the result?