Darren/feat/tx replacement

[darrenvechain]

Description

Draft idea for replacing txs in the pool. Lots of TODOs and tidy up.

See tx_relpacement_test.go to see a working example

• Concerns around nonce collision? Bytes32 instead of uint64 ?

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• New and existing E2E tests pass locally with my changes
• Any dependent changes have been merged and published in downstream modules
• I have not added any vulnerable dependencies to my code

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 17.30769% with 129 lines in your changes missing coverage. Please review.

Project coverage is 61.84%. Comparing base (5e5f63d) to head (b914c08).

Files with missing lines	Patch %	Lines
txpool/tx_object_map.go	9.61%	45 Missing and 2 partials ⚠️
state/state.go	0.00%	15 Missing ⚠️
tx/transaction.go	0.00%	14 Missing and 1 partial ⚠️
txpool/validation.go	7.14%	12 Missing and 1 partial ⚠️
consensus/validator.go	0.00%	11 Missing and 1 partial ⚠️
packer/flow.go	0.00%	7 Missing and 1 partial ⚠️
txpool/tx_object.go	0.00%	7 Missing and 1 partial ⚠️
tx/builder.go	0.00%	7 Missing ⚠️
consensus/consensus.go	40.00%	2 Missing and 1 partial ⚠️
tx/features.go	90.90%	1 Missing ⚠️

Additional details and impacted files

@@                  Coverage Diff                  @@
##           release/galactica    #1008      +/-   ##
=====================================================
- Coverage              62.16%   61.84%   -0.33%     
=====================================================
  Files                    226      226              
  Lines                  23700    23844     +144     
=====================================================
+ Hits                   14733    14746      +13     
- Misses                  7825     7947     +122     
- Partials                1142     1151       +9     

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