fix: issue where objects using HexBytes could not serialize [APE-1226]

[antazoey]

What I did

Having the toughest time converting TraceFrames from evm_trace into JSON. Figured it was best to fix at the source so this wouldnt happen anywhere else.

How I did it

Create a custom dumps method that handles HexBytes

How to verify it

Create a model with a sub-dict using HexBytes as its keys Make sure can call .json() on that model.

Checklist

• [ ] Passes all linting checks (pre-commit and CI jobs)
• [ ] New test cases have been added and are passing
• [ ] Documentation has been updated
• [ ] PR title follows Conventional Commit standard (will be automatically included in the changelog)

[antazoey]

This will likely be needed for the work @Ninjagod1251 is doing