feat: allow '/' and '.' in type and relation names

[bubianchi-criteo]

Description

In the FGA DSL, this change allows type and relations identifiers to contain / (slash) and . (dot) characters.
Moreover some restrictions are applied:

• an identifier must start with a letter or an underscore
• an identifier must end with a letter, an underscore or a digit
• an identifier can not contain two consecutive slash, dot or minus

References

See discussion

Review Checklist

• I have clicked on "allow edits by maintainers".
• I have added documentation for new/changed functionality in this PR or in a PR to openfga.dev [Provide a link to any relevant PRs in the references section above]
• The correct base branch is being used, if not main
• I have added tests to validate that the change in functionality is working as expected

[linux-foundation-easycla]

The committers listed above are authorized under a signed CLA.

• ✅ login: bubianchi-criteo / name: Bruno Bianchi (272a33c)