Feat/terraform provider

[RobbertDM]

Don't review yet, in draft, more of a scratchpad for myself.
I know it's not a small single-resource PR like you said but high-level, I think this comes closer to what you envision for a terraform provider?

• Filter out deprecated API routes to generate openapi-no-deprecated.json (OpenAPI 3.1.0)
• SDK generation using the recently open-sourced oapi-codegen-dd from Doordash https://github.com/doordash-oss/oapi-codegen-dd because that supports OpenAPI 3.1.0
• terraform vibe coded from generated SDK (this is why I don't want you to review yet, I want to do more functional tests first, see below)
• tf docs generated using github.com/hashicorp/terraform-plugin-docs

TODOs from your comments at #2235

• Test with local portal deployment
• end-to-end test, spinning up fresh portal, unleashing lots of resources onto that portal, somehow verifying that they have been made, terraform destroy them, somehow verify that they're gone
• end-to-end test in CI/CD
• See if that no-deprecated dance is necessary, could be that the doordash oapi-codegen has a filter for this itself that you can set in the config file.
• Apparently there is a Go CLI, do you still want to revive that thing using the newly generated SDK? The last code generation is from june 2024 and still called bifrost.gen.go :D

• Update the release notes document if needed in the release notes
• When updating the UI please provide screenshots or videos to the reviewers