Add a redis resource

[hughesjj]

What are you trying to achieve?
I want a resource for redis' db.instance.

Additional context.
This is prep work to supporting Redis as a metric (not solely trace as we currently have), but should stand on its own. I'm resurrecting (+fixing) code submitted by manang-splunk@ at the beginning of this year.

Original PR: #2145

[hughesjj]

This is my "fixed" version of the redis resource:
Related PR: #2836

To my understanding there's an effort to more formally standardize otel specs, I'm not sure if that affects this PR at all.

I'm also cutting pull requests to build-tools to hopefully give people a better time developing/debugging specifications for anyone interested.

[hughesjj]

I'll be reaching out to various people from the following PRs who seem to have gone down a similar track

• Add redis specification #2525
• Add redis metrics semantic conventions #2547

[hughesjj]

Closed due to being not needed, we can continue use the existing file specified in trace for now. Will wait to do any sort of refactoring until after the semantic conventions SIG