Introducing: polaris.readiness.ignore-offending-properties

[fivetran-kostaszoumpatianos]

Fixes: #2471

This PR introduces a polaris.readiness.ignore-offending-properties config that accepts a map of properties for which readiness checks are suppressed.

It can be used, for example, as follows:

polaris.readiness.ignore-offending-properties=\
  polaris.metrics.user-principal-tag.enable-in-api-metrics,\
  polaris.features."ALLOW_INSECURE_STORAGE_TYPES",\
  polaris.features."SUPPORTED_CATALOG_STORAGE_TYPES"

The check performed is case-insesitive.