refactor: Rename transactor files/classes to match the tx name

[mvadari]

High Level Overview of Change

This PR refactors the transactor code so that the transactor classes and filenames (and other artifacts like logs) match the canonical transaction names (e.g. SetTrust -> TrustSet and PayChanCreate -> PaymentChannelCreate).

Context of Change

This has been a long-time minor annoyance in this codebase, and #6483 and #6495 made this a lot easier to do.

API Impact

N/A

[Tapanito]

What a change! LGTM

[codecov]

Codecov Report

❌ Patch coverage is 97.91667% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 79.7%. Comparing base (804a351) to head (1bb8abb).
⚠️ Report is 1 commits behind head on develop.

Files with missing lines	Patch %	Lines
...c/libxrpl/tx/transactors/account/AccountDelete.cpp	90.9%	1 Missing ⚠️
src/libxrpl/tx/transactors/dex/OfferCancel.cpp	75.0%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff            @@
##           develop   #6580     +/-   ##
=========================================
- Coverage     79.7%   79.7%   -0.0%     
=========================================
  Files          878     878             
  Lines        68116   68116             
  Branches      7557    7559      +2     
=========================================
- Hits         54311   54310      -1     
- Misses       13805   13806      +1     

Files with missing lines	Coverage Δ
include/xrpl/protocol/detail/transactions.macro	100.0% <ø> (ø)
include/xrpl/tx/Transactor.h	100.0% <ø> (ø)
...nclude/xrpl/tx/transactors/account/AccountDelete.h	100.0% <100.0%> (ø)
include/xrpl/tx/transactors/account/AccountSet.h	100.0% <100.0%> (ø)
...nclude/xrpl/tx/transactors/account/SignerListSet.h	100.0% <100.0%> (ø)
include/xrpl/tx/transactors/check/CheckCancel.h	100.0% <100.0%> (ø)
include/xrpl/tx/transactors/check/CheckCash.h	100.0% <100.0%> (ø)
include/xrpl/tx/transactors/check/CheckCreate.h	100.0% <100.0%> (ø)
include/xrpl/tx/transactors/delegate/DelegateSet.h	100.0% <ø> (ø)
include/xrpl/tx/transactors/dex/OfferCancel.h	100.0% <100.0%> (ø)
... and 30 more

... and 3 files with indirect coverage changes

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