Add support for allowed_clients

[lpakula]

Proposed Changes

• add allowed_clients attribute

Fixes #441

Acceptance Test Output

$ make testacc TESTS=TestAccClient
==> Checking that code complies with gofmt requirements...
?   	github.com/alexkappa/terraform-provider-auth0	[no test files]
=== RUN   TestAccClientGrant
--- PASS: TestAccClientGrant (8.52s)
=== RUN   TestAccClient
--- PASS: TestAccClient (1.99s)
=== RUN   TestAccClientZeroValueCheck
--- PASS: TestAccClientZeroValueCheck (4.62s)
=== RUN   TestAccClientRotateSecret
--- PASS: TestAccClientRotateSecret (3.38s)
=== RUN   TestAccClientInitiateLoginUri
--- PASS: TestAccClientInitiateLoginUri (0.06s)
=== RUN   TestAccClientJwtScopes
--- PASS: TestAccClientJwtScopes (3.05s)
=== RUN   TestAccClientMobile
--- PASS: TestAccClientMobile (3.37s)
=== RUN   TestAccClientMobileValidationError
--- PASS: TestAccClientMobileValidationError (0.01s)
PASS
coverage: 20.8% of statements
ok  	github.com/alexkappa/terraform-provider-auth0/auth0	25.019s	coverage: 20.8% of statements
?   	github.com/alexkappa/terraform-provider-auth0/auth0/internal/debug	[no test files]
testing: warning: no tests to run
PASS
coverage: 0.0% of statements
ok  	github.com/alexkappa/terraform-provider-auth0/auth0/internal/random	0.011s	coverage: 0.0% of statements [no tests to run]
testing: warning: no tests to run
PASS
coverage: 0.0% of statements
ok  	github.com/alexkappa/terraform-provider-auth0/auth0/internal/validation	0.001s	coverage: 0.0% of statements [no tests to run]
?   	github.com/alexkappa/terraform-provider-auth0/version	[no test files]

Community Note

• Please vote on this pull request by adding a 👍 reaction to the original pull request comment to help the community and maintainers prioritize this request
• Please do not leave "+1" comments, they generate extra noise for pull request followers and do not help prioritize the request

[alexkappa]

@lpakula this looks good, and the tests are passing. I'll merge it in and release it with the next version. Thanks!