feat: add AWS integration resources

[tinchi]

Add aws configurations as tf resource based on the https://docs.cortex.io/api/readme/integrations/aws api

[Cantaley]

@tinchi - transferring the comments from the ticket to here:
After review this, the structure looks good overall. There are four blockers we need addressed before merge:

• Perpetual drift in cortex_aws_integration_types Read (aws_integration_types_resource.go:567). Read replaces local state with the full catalog returned by /aws/types, so every subsequent plan shows a diff. Fix by filtering FromApiModel to entries already in r.Types (or only Configured == true), or restructure as a map keyed by type name with per-key merging in Read.

• Destructive Delete on cortex_aws_integration_types (line 633). UpdateTypes(ctx, []cortex.AwsType{}) may disable AWS discovery tenant-wide if the API treats an empty list as "unconfigure everything." Please verify the API contract. Safer options: no-op Delete with a comment, or only flip back entries currently in state.

• Incomplete ImportState (line 640). Sets id but not the required types attribute. With issue #1 unresolved, post-import Read won't match any sensible HCL. Either document the import semantics clearly or drop ResourceWithImportState for now.

-Singleton not enforced. Docs claim cortex_aws_integration_types is a singleton, but multiple instances will silently overwrite each other. Ideally, use a constant resource ID and detect collisions in Create.