Introducing base fee + hard fork logic

[paologalligit]

Description

This PR is introducing a new field called BaseFee. This is included in the block's header and fixes the gas threshold a tx must have to be included in the block.

GH-Issue

Type of change

Please delete options that are not relevant.

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update

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 72.02680% with 167 lines in your changes missing coverage. Please review.

Please upload report for BASE (release/galactica@effd7f5). Learn more about missing BASE report.

Files with missing lines	Patch %	Lines
tx/transaction.go	42.85%	96 Missing and 4 partials ⚠️
tx/tx_dynamic_fee.go	83.33%	9 Missing and 2 partials ⚠️
block/extension.go	66.66%	6 Missing and 4 partials ⚠️
tx/hashing.go	10.00%	9 Missing ⚠️
block/header.go	38.46%	6 Missing and 2 partials ⚠️
consensus/fork/galactica.go	87.93%	5 Missing and 2 partials ⚠️
consensus/validator.go	82.60%	4 Missing ⚠️
tx/builder.go	93.10%	4 Missing ⚠️
cmd/thor/solo/solo.go	40.00%	2 Missing and 1 partial ⚠️
tx/tx_legacy.go	94.73%	3 Missing ⚠️
... and 5 more

Additional details and impacted files

@@                 Coverage Diff                  @@
##             release/galactica     #933   +/-   ##
====================================================
  Coverage                     ?   61.11%           
====================================================
  Files                        ?      225           
  Lines                        ?    23937           
  Branches                     ?        0           
====================================================
  Hits                         ?    14628           
  Misses                       ?     8135           
  Partials                     ?     1174           

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