Better detection of rest request templated paths for metrics (micrometer)

[ebullient]

Description
Follow on from #14813

Using matchPattern to replace the URI used with http metrics tags is error prone. The existing detection mechanism was cursory, and only worked for simple paths.

Implementation ideas

For ResteasyReactive, we have a chance to expose the known/used template path more directly as part of the SimplifiedResourceInfo associated with the RuntimeResource. We can still hide a lot of the gorpy details while providing a reasonable String representation of the matched URI.

For older Resteasy, this is harder, and a bit more expensive to find the bits required to put the URI together.

For undertow.... yuck? (still thinking about it)

[quarkus-bot]

/cc @jmartisk