[pkg/opentelemetrytransformationlanguage] Rename TQL to OTTL

[TylerHelmuth]

Description:
Renames TQL to OTTL. No functional changes

Link to tracking Issue:
Resolves #13919

Testing:
Unit tests

Documentation:
All documentation/links have been updated

[TylerHelmuth]

Not opposed to shortening the package directory to oteltransformationlanguage

[jpkrohling]

cc @kovrus

[evan-bradley]

I found a handful of places where lowercase tql is replaced with uppercase OTTL. There are a handful of places where OTTLotel is specified in import paths where I didn't comment on every one. I've highlighted once instance, it should be easy to find and replace the rest.

As for renaming the directory to pkg/oteltransformationlanguage, I think that would make sense since the current name is so long. Abbreviations are common in component names (e.g. k8s or attrs), and otel is already used in internal/otelcontribcore, so I think there's some precedent for it as well.

[TylerHelmuth]

@evan-bradley I think I addressed all your feedback.

[evan-bradley]

I found a few additional replacements needed in a readme, but otherwise looks good.

[TylerHelmuth]

@evan-bradley @bogdandrutu @kentquirk @kovrus please take a look.