Mark deprecations for Micrometer integration component #9085
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Description
Resolves #8946
Releases before 4.x provided some convenient ways developers could use Micrometer in their applications, including some configuration help and CDI injection and interceptor support for the Micrometer annotations and meter types. Using those tools, the Micrometer meters were completely separate from the Helidon metrics managed using the Helidon metrics API.
Now that Helidon 4 uses Micrometer for its own metrics implementation, the former approach is obsolete, inefficient, and unneeded.
As one step of providing even better integration with Micrometer, this PR marks as deprecated-for-removal the public types of the integration component; we plan to remove them in a future major release of Helidon.
Documentation
There are existing files in our docs area for Micrometer integration, but there are no links to them on our 4.x doc pages. So there are no doc updates needed as part of this PR.