feat: add U64HexOrNumber type

[mattsse]

ref #3328

Adds helper type to support numbers u64 and hex string U64

[codecov[bot]]

Codecov Report

Merging #3329 (4d344c2) into main (5cd2148) will increase coverage by 0.01%. The diff coverage is 60.86%.

@@            Coverage Diff             @@
##             main    #3329      +/-   ##
==========================================
+ Coverage   69.72%   69.73%   +0.01%     
==========================================
  Files         531      531              
  Lines       71681    71727      +46     
==========================================
+ Hits        49976    50018      +42     
- Misses      21705    21709       +4     

Flag	Coverage Δ
integration-tests	16.34% <0.00%> (-0.03%)	:arrow_down:
unit-tests	64.78% <60.86%> (+0.01%)	:arrow_up:

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
crates/primitives/src/serde_helper/num.rs	81.05% <60.86%> (-18.95%)	:arrow_down:

... and 10 files with indirect coverage changes