deps: bump openzeppelin to 5.2.0 and remove our own impls

[gjermundgaraba]

Description

New version of open zeppelin! Finally we can get rid of our own parsers and slicers 🙌

closes: #14

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• Linked to GitHub issue with discussion and accepted design, OR link to spec that describes this work.
• Wrote unit and integration tests.
• Added relevant natspec and godoc comments.
• Provide a conventional commit message to follow the repository standards.
• Re-reviewed Files changed in the GitHub PR explorer.
• Review SonarCloud Report in the comment section below once CI passes.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 98.66%. Comparing base (f639c91) to head (68850ec).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #209      +/-   ##
==========================================
+ Coverage   96.97%   98.66%   +1.69%     
==========================================
  Files          11       11              
  Lines         562      526      -36     
==========================================
- Hits          545      519      -26     
+ Misses         17        7      -10     

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[srdtrk]

Lgtm. The way we take benchmark has changed due to the proxy contracts. So I don't believe these new numbers are correct. I will fix these and then merge.