(wip) refactor: action enum

[swissarmytowel]

Summary

Removes ActionType enum and all relevant code in favour of defining in every margin engine repo.

Checklist

Ensure you completed all of the steps below before submitting your pull request:

• Add natspec for all functions / parameters
• Ran forge snapshot
• Ran forge fmt
• Ran forge test
• Triage Slither issues, and post uncertain ones in the PR

[github-actions]

Gas usage comparison:

Suite	Case	Gas Diff	Percentage Change
BaseDebitSpreadEngineFlow	testAddCollateralMoveBalance	♻️ -249	-0.37%
	testAddLongShouldMoveToken	♻️ -440	-0.43%
	testBurnActionShouldBurnOption	♻️ -352	-0.67%
	testCannotAddCollatFromOthers	♻️ -254	-1.63%
	testCannotAddLongFromOthers	♻️ -227	-1.41%
	testCannotBurnFromOthers	♻️ -219	-1.28%
	testCannotMergeWithSameStrike	♻️ -122	-0.78%
	testCannotRemoveMoreThanEngineHas	♻️ -474	-0.65%
	testMergeActionShouldBurnToken	♻️ -272	-0.51%
	testMintActionShouldMintOption	♻️ -214	-0.36%
	testRemoveCollateralMoveBalance	♻️ -399	-0.68%
	testRemoveLongShouldPullToken	♻️ -455	-0.58%
	testSettlementShouldEmitEvent	♻️ -158	-0.63%
	testSplitActionShouldMintToken	♻️ -236	-0.39%
OptionTransferableTest	testCanTransferCollat	♻️ -648	-0.61%
	testCannotTransferShortIfEndingUnderwater	♻️ -647	-0.58%
	testMintOptionToOtherAccount	♻️ -647	-0.40%
	testTransferLong	♻️ -635	-0.56%
	testTransferShort	♻️ -646	-0.47%

[codecov]

Codecov Report

Merging #240 (3340e99) into master (1d18f28) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #240   +/-   ##
=======================================
  Coverage   91.45%   91.45%           
=======================================
  Files          14       14           
  Lines         351      351           
  Branches       73       73           
=======================================
  Hits          321      321           
  Misses         20       20           
  Partials       10       10           

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[antoncoding]

Please rebase this PR before merging!