exploratory: dropping hex.String

[abi87]

WIP, working on defining the wanted end state, will break this into smaller PR as soon as I have done.

[coderabbitai]

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[codecov]

Codecov Report

Attention: Patch coverage is 75.96899% with 31 lines in your changes missing coverage. Please review.

Project coverage is 21.79%. Comparing base (8de0789) to head (caca212).
Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
mod/primitives/pkg/encoding/hex/big_int.go	63.88%	9 Missing and 4 partials ⚠️
mod/primitives/pkg/encoding/hex/validation.go	60.00%	7 Missing and 5 partials ⚠️
mod/primitives/pkg/common/execution.go	0.00%	3 Missing ⚠️
mod/primitives/pkg/bytes/b256.go	0.00%	1 Missing ⚠️
mod/primitives/pkg/common/consensus.go	0.00%	1 Missing ⚠️
mod/primitives/pkg/encoding/hex/bytes.go	83.33%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2045      +/-   ##
==========================================
- Coverage   22.10%   21.79%   -0.31%     
==========================================
  Files         357      357              
  Lines       15972    15891      -81     
  Branches       12       12              
==========================================
- Hits         3530     3463      -67     
+ Misses      12295    12279      -16     
- Partials      147      149       +2     

Files with missing lines	Coverage Δ
mod/primitives/pkg/bytes/b.go	100.00% <100.00%> (ø)
mod/primitives/pkg/bytes/b20.go	100.00% <100.00%> (ø)
mod/primitives/pkg/bytes/b32.go	100.00% <100.00%> (ø)
mod/primitives/pkg/bytes/b4.go	71.42% <100.00%> (ø)
mod/primitives/pkg/bytes/b48.go	100.00% <100.00%> (ø)
mod/primitives/pkg/bytes/b8.go	100.00% <100.00%> (ø)
mod/primitives/pkg/bytes/b96.go	100.00% <100.00%> (ø)
mod/primitives/pkg/encoding/hex/fixed-length.go	100.00% <100.00%> (ø)
mod/primitives/pkg/encoding/hex/u64.go	86.36% <100.00%> (-2.53%)	⬇️
mod/primitives/pkg/math/u64.go	100.00% <100.00%> (ø)
... and 8 more

[abi87]

replaced by ToBytes since:

1. formatAndValidateText is equivalent to IsValidHex for every current call:

• inputs are never zero-lenght
• The check on lenght being even is implicitly done by DecodeString

2. hex.Decode behaviour with dec := make([]byte, len(raw)/encDecRatio) matches hex.DecodeString(

[abi87]

q: shouldn't this be part of ValidateBasicHex but some UTs currently fail

[abi87]

Replaced by #2048