move transaction module into actions/ and rename to set_transaction

[zachschuermann]

Prefactor for write-path work. this does three things

1. move transaction into actions module
2. rename module to set_transaction and Transaction to SetTransaction
3. add commitInfo to actions schema and define a commit info object which (for now) just includes kernel version

[codecov]

Codecov Report

Attention: Patch coverage is 96.96970% with 1 line in your changes missing coverage. Please review.

Project coverage is 77.69%. Comparing base (6b0df5d) to head (1fdb098).

Files with missing lines	Patch %	Lines
kernel/src/actions/visitors.rs	91.66%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #386   +/-   ##
=======================================
  Coverage   77.68%   77.69%           
=======================================
  Files          49       49           
  Lines       10084    10087    +3     
  Branches    10084    10087    +3     
=======================================
+ Hits         7834     7837    +3     
  Misses       1805     1805           
  Partials      445      445           

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[nicklan]

mostly lgtm, just a couple small nits

[scottsand-db]

LGTM. This brings the name of the "transaction" ("txn") Delta protocol action to be en-par with how Delta-Kernel-API and Delta-Spark refer to it as in the code, a SetTransaction. That name is a signification improvement over "Transaction", and the unification between the kernels is also great.

[nicklan]

One last thing I noticed that needs to be renamed. You'll also need to fix the name in inspect-table/src/main.rs due to #190

[nicklan]

lgtm!