Add support for Micrometers Metertag

[Lukas-Kaufmann]

Feature description

Micrometers annotation Metertag is intended to add tags to metrics based on a methods parameter. It would be nice to have this feature supported.

[fivezeroes]

An alternative approach could be supporting the new expression syntax and using the extraTags field, I would be happy with either solution.

[hrothwell]

An alternative approach could be supporting the new expression syntax and using the extraTags field, I would be happy with either solution.

FWIW that is not actually a viable option right now:

https://github.com/micronaut-projects/micronaut-core/issues/10538

I am in the progress on working on something which may or may not support this, albeit not as nicely if I had to guess