feat: ssz encode and decode for uint

[loocapro]

Motivation

Completing SSZ implementation also for Uint types: alloy-rs/core#407

Solution

Implementing Encode and Decode traits from https://github.com/sigp/ethereum_ssz

PR Checklist

• Added Tests
• Added Documentation
• Updated the changelog

[DaniPopes]

this needs a separate explicit feature instead of the implicit one

[codecov]

Codecov Report

Attention: 15 lines in your changes are missing coverage. Please review.

Comparison is base (7c0c88c) 80.57% compared to head (24d9f48) 80.53%.

Files	Patch %	Lines
src/support/ssz.rs	72.22%	15 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #344      +/-   ##
==========================================
- Coverage   80.57%   80.53%   -0.05%     
==========================================
  Files          54       55       +1     
  Lines        6179     6231      +52     
==========================================
+ Hits         4979     5018      +39     
- Misses       1200     1213      +13     

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[prestwich]

Looks like tiny-keccak is CC0-1.0 which is odd. We'll need to explicitly add that license to the approved list in deny.toml

[prestwich]

okay last thing I promise, please update CHANGELOG.md 🖖