feat(telemetry): add configurable histogram buckets for metrics

[bnjjj]

You can customize the buckets for all generated histograms:

telemetry:
  metrics:
    common:
      buckets:
        - 0.05
        - 0.10
        - 0.25
        - 0.50
        - 1.00
        - 2.50
        - 5.00
        - 10.00
        - 20.00

Fixes #2333

Checklist

Complete the checklist (and note appropriate exceptions) before a final PR is raised.

• Changes are compatible[^1]
• Documentation[^2] completed
• Performance impact assessed and acceptable
• Tests added and passing[^3]
  • Unit Tests
  • Integration Tests
  • Manual Tests

Exceptions

Note any exceptions here

Notes

[^1]. It may be appropriate to bring upcoming changes to the attention of other (impacted) groups. Please endeavour to do this before seeking PR approval. The mechanism for doing this will vary considerably, so use your judgement as to how and when to do this.
[^2]. Configuration is an important part of many changes. Where applicable please try to document configuration examples.
[^3]. Tick whichever testing boxes are applicable. If you are adding Manual Tests:
- please document the manual testing (extensively) in the Exceptions.
- please raise a separate issue to automate the test and label it (or ask for it to be labeled) as manual test

[router-perf]

CI performance tests

• pr - Basic stress test that finds the max RPS when no features are configured
• reload - Reload test over a long period of time at a constant rate of users