feat: support multiple foyer instance share the same prometheus

[MrCroxx]

What's changed and what's your intention?

Please explain IN DETAIL what the changes are in this PR and why they are needed. :D

As title. See the unit tests for correct usages.

Checklist

• I have written the necessary rustdoc comments
• I have added the necessary unit tests and integration tests
• I have passed make all (or make fast instead if the old tests are not modified) in my local environment.

Related issues or PRs (optional)

close #800

[codecov]

Codecov Report

Attention: Patch coverage is 97.45763% with 3 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
foyer-common/src/metrics/registry/prometheus.rs	97.45%	3 Missing ⚠️

Files with missing lines	Coverage Δ
foyer-common/src/metrics/registry/prometheus.rs	98.29% <97.45%> (-1.71%)	⬇️