chore: allow booleans and numbers in metric detail

[just-boris]

Issue #, if available:

Description of changes:

This works today, but not allowed by types

metrics.sendOpsMetricObject('awsui-ops-demo', { somethingCount: 1 });

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 99.40%. Comparing base (beaa531) to head (0c6b90e).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #153   +/-   ##
=======================================
  Coverage   99.40%   99.40%           
=======================================
  Files          34       34           
  Lines         840      840           
  Branches      227      240   +13     
=======================================
  Hits          835      835           
  Misses          5        5           

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