feat: add allowed/forbidden account id fields, verify func

[jar-b]

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" or other comments that do not add relevant new information or questions, they generate extra noise for pull request followers and do not help prioritize the request

Relates hashicorp/terraform#33688

Adds AllowedAccountIds and ForbiddenAccountIds fields to the base Config struct, along with a method to verify whether a given account is permitted. This will centralize the logic currently implemented in AWS Provider to allow for re-use with other upstream interfaces.

[ewbankkit]

LGTM 🚀.

% git checkout f-verify-allowed-accounts
branch 'f-verify-allowed-accounts' set up to track 'origin/f-verify-allowed-accounts'.
Switched to a new branch 'f-verify-allowed-accounts'
ewbankkit@ewbankkit-C02F408DML85 aws-sdk-go-base % go test -v ./internal/config 
=== RUN   TestConfig_VerifyAccountIDAllowed
=== RUN   TestConfig_VerifyAccountIDAllowed/empty
=== RUN   TestConfig_VerifyAccountIDAllowed/allowed
=== RUN   TestConfig_VerifyAccountIDAllowed/not_allowed
=== RUN   TestConfig_VerifyAccountIDAllowed/forbidden
=== RUN   TestConfig_VerifyAccountIDAllowed/not_forbidden
=== RUN   TestConfig_VerifyAccountIDAllowed/allowed_and_forbidden
--- PASS: TestConfig_VerifyAccountIDAllowed (0.00s)
    --- PASS: TestConfig_VerifyAccountIDAllowed/empty (0.00s)
    --- PASS: TestConfig_VerifyAccountIDAllowed/allowed (0.00s)
    --- PASS: TestConfig_VerifyAccountIDAllowed/not_allowed (0.00s)
    --- PASS: TestConfig_VerifyAccountIDAllowed/forbidden (0.00s)
    --- PASS: TestConfig_VerifyAccountIDAllowed/not_forbidden (0.00s)
    --- PASS: TestConfig_VerifyAccountIDAllowed/allowed_and_forbidden (0.00s)
PASS
ok  	github.com/hashicorp/aws-sdk-go-base/v2/internal/config	0.432s