Add micronaut-micrometer-registry-otlp binding for micrometer-registry-otlp

[cltnschlosser]

I think this might resolve https://github.com/micronaut-projects/micronaut-micrometer/issues/615, not sure based on the discussion there. I didn't seek to create this because of that issue.

I'm using this Factory in a service that I maintain and I wanted to make a library that other people could use, but I was struggling to get the jar to contain the proper metadata so that micronaut would load it. I decided it was probably easier to just upstream it here instead of trying to recreate the build process in this repo.

[CLAassistant]

All committers have signed the CLA.

[graemerocher]

Thanks for the contribution!