feat: replace NumberOrHex

[acdibble]

Pull Request

Checklist

Please conduct a thorough self-review before opening the PR.

• I am confident that the code works.
• I have updated documentation where appropriate.

Summary

Use the replacement NumberOrHex enum. Its advantage is that it safely serializes integers for languages whose only number type is a double precision floating point (looks sideways towards JS)

[codecov]

Codecov Report

Merging #4163 (bcf0b8c) into main (ed0baff) will increase coverage by 0%.
The diff coverage is 66%.

@@          Coverage Diff          @@
##            main   #4163   +/-   ##
=====================================
  Coverage     72%     72%           
=====================================
  Files        379     379           
  Lines      61544   61560   +16     
  Branches   61544   61560   +16     
=====================================
+ Hits       44104   44125   +21     
+ Misses     15140   15136    -4     
+ Partials    2300    2299    -1     

Files	Coverage Δ
...lities/src/with_std/serde_helpers/number_or_hex.rs	0% <ø> (ø)
utilities/src/with_std.rs	72% <0%> (ø)
utilities/src/with_std/rpc.rs	98% <95%> (+19%)	⬆️
state-chain/custom-rpc/src/lib.rs	23% <0%> (-<1%)	⬇️

... and 5 files with indirect coverage changes

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