feat: add Forms management commands

[developerkunal]

🔧 Changes

Add first-class Auth0 Forms management to the CLI:

• Add forms list, show, create, update, delete, open, export, and import.
• Support interactive prompts, JSON/CSV output, and non-interactive automation.
• Provide JSON payloads through --data as inline JSON, a file (@form.json), or piped stdin. On create and update the payload is validated against the OpenAPI schema before it is sent, and it cannot be combined with the scalar flags (--name, --language-*). Bodies are sent as raw JSON so STEP/ROUTER node config is preserved instead of being dropped by the typed request models.
• Make interactive creation lightweight:
  • auth0 forms create prompts for a name and creates a minimal scaffold.
  • auth0 forms create --edit opens the complete JSON body in an editor.
  • auth0 forms create --example prints an embedded example body suitable for --data.
  • auth0 forms create --schema and auth0 forms update --schema print the accepted request payload schema.
• forms import accepts both a flat form graph and the Dashboard envelope (version, form, flows, connections), creating the bundled flows and mapping each #CONN-N# placeholder to a vault connection (interactively or with --connection).
• Open Forms directly in the Auth0 Dashboard builder with forms open, reusing the shared builder-URL helpers that the Flows commands use.

Additional updates:

• Require --force for Forms deletion in agent mode.
• Add the required Forms Management API scopes.

🔬 Testing

• Unit tests, go vet, and lint pass.
• Command docs regenerated with make docs and verified in sync.
• Integration test cases were updated to use --data. The integration suite runs against a live tenant, so those updated cases have not been re-run since the --data migration.

📝 Checklist

• All new/changed/fixed functionality is covered by tests.
• I have added documentation for all new/changed functionality.

[codecov-commenter]

Codecov Report

❌ Patch coverage is 69.51439% with 339 lines in your changes missing coverage. Please review.
✅ Project coverage is 61.31%. Comparing base (86b69ea) to head (824f19b).
⚠️ Report is 27 commits behind head on main.

Files with missing lines	Patch %	Lines
internal/cli/forms.go	67.22%	174 Missing and 62 partials ⚠️
internal/cli/forms_envelope.go	68.07%	66 Missing and 17 partials ⚠️
internal/display/forms.go	85.21%	15 Missing and 2 partials ⚠️
internal/cli/terraform_fetcher.go	78.57%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1626      +/-   ##
==========================================
+ Coverage   60.60%   61.31%   +0.70%     
==========================================
  Files         135      151      +16     
  Lines       26385    30252    +3867     
==========================================
+ Hits        15991    18548    +2557     
- Misses       9407    10468    +1061     
- Partials      987     1236     +249     

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