Handle `-` in generated instrumentation name

[sambostock]

Currently, dashes are ignored, resulting in invalid constants such as

OpenTelemetry::Instrumentation::Foo-bar::VERSION

being generated by running

bin/instrumentation_generator foo-bar

While convention would dictate that foo-bar map to Foo::Bar, this would require a larger refactor.

[plantfansam]

Hello, and thank you for your contribution!

We recently split Ruby instrumentation out into the opentelemetry-ruby-contrib repo.

This PR is related to instrumentation, so we'll need you to re-open it against opentelemetry-ruby-contrib. Sorry for the inconvenience!

To do that, you can:

1. Create a fork of opentelemetry-ruby-contrib and copy the git url
2. In your opentelemetry-ruby repo, run git remote add tmp-contrib <your-fork-git-url>
3. git push tmp-contrib your-branch-name
4. Open a new PR in contrib (feel free to just copy/paste your original PR description there)
5. Close your open PR in this repo with a comment that links to your new PR in contrib
6. Delete your tmp-contrib remote from opentelemetry-ruby (git remote rm tmp-contrib)
7. git clone your opentelemetry-ruby-contrib fork, check out your branch, and make all changes in that repo from now on!

Sorry again for the inconvenience, and thank you for contributing!

[github-actions[bot]]

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