Renaming and refactoring the other project references

[Gogotchuri]

I understand this is a huge PR, but it is broken down into separate commits that are easier to review.
(Most of the additions +2803 are from the auto-generated functions in 1.9.0.go file)
I advise going through this PR commit by commit and checking each one.

Resolves #8

Changes in this PR:

• Correct hover docs URLs previously referencing hashicorp.io
• Change the oldest and the newest versions now referencing the actual generated OpenTofu versions returned by the API
• Rename semantic tokens with tofu-prefix
• Change the GitHub repository and object references to correct repositories
• Add deprecations to deprecated backends
• Rewrite comments referencing Terraform

I will not squash this PR since including separate commits makes more sense.

[yottta]

LGTM.
The results returned by grep -r "terraform" . | grep -v "terraform_remote_state" | grep -v "_test.go" in this branch seem that to contain only things that are actually required. Could somebody, more knowledgeable than I am, double check this?
Thanks

[diofeher]

I've left a few nitpicks, but aside from those, it looks great. Thanks for the excellent work!

[Gogotchuri]

Thanks for the feedback.
We couldn't have missed anything critical here. We need this merged to move forward with tofu-ls and release the first 0.0.1 versions.
This project still needs a lot of refactoring, and additional changes will be implemented after the first release.
I'll merge this. If the issues you pointed out aren't fully covered by the #21, please open additional, more specific ones.