feat: Support uint Keys

[jcalabro]

Description

This adds support for the uint primitive as a cache key.

One note, I see from the checklist linting passes locally, but there are no instructions or a makefile that indicate how to run the linter in your preferred config. I've checked the box anyways because the tests pass locally and this is a tiny PR, but happy to run the linter. go vet ./... and golangci-lint run both report issues that are unrelated to this change FWIW.

Checklist

• Code compiles correctly and linting passes locally
• For all code changes, an entry added to the CHANGELOG.md file describing and linking to
  this PR
• Tests added for new functionality, or regression tests for bug fixes added as applicable