Add data source for DX Router Configuration

[schuylr]

Description

Adds the aws_dx_router_configuration data source to allow users to download sample router configurations for their Direct Connect VIF.

Relations

Closes #26432

References

https://docs.aws.amazon.com/directconnect/latest/UserGuide/create-vif.html#vif-router-config
https://docs.aws.amazon.com/sdk-for-go/api/service/directconnect/#DirectConnect.DescribeRouterConfiguration
https://pkg.go.dev/github.com/aws/aws-sdk-go-v2/service/directconnect#Client.DescribeRouterConfiguration
https://docs.aws.amazon.com/directconnect/latest/APIReference/API_DescribeRouterConfiguration.html
https://docs.aws.amazon.com/directconnect/latest/APIReference/API_RouterType.html

Output from Acceptance Testing

Note that a DX VIF must be provided via the VIRTUAL_INTERFACE_ID env variable.

terraform-provider-aws % AWS_DEFAULT_REGION=eu-west-1 VIRTUAL_INTERFACE_ID=dxvif-xxxxxxxx make testacc TESTS=TestAccDirectConnectRouterConfigurationDataSource_basic PKG=directconnect
==> Checking that code complies with gofmt requirements...
TF_ACC=1 go test ./internal/service/directconnect/... -v -count 1 -parallel 20 -run='TestAccDirectConnectRouterConfigurationDataSource_basic'  -timeout 180m
=== RUN   TestAccDirectConnectRouterConfigurationDataSource_basic
=== PAUSE TestAccDirectConnectRouterConfigurationDataSource_basic
=== CONT  TestAccDirectConnectRouterConfigurationDataSource_basic
--- PASS: TestAccDirectConnectRouterConfigurationDataSource_basic (19.31s)
PASS
ok  	github.com/hashicorp/terraform-provider-aws/internal/service/directconnect	23.515s

[github-actions]

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[GlennChia]

PR looks good, requesting small styling changes, no functional changes required.

[GlennChia]

LGTM!

[ewbankkit]

LGTM 🚀.

% make testacc TESTS=TestAccDirectConnectRouterConfigurationDataSource_ PKG=directconnect
==> Checking that code complies with gofmt requirements...
TF_ACC=1 go test ./internal/service/directconnect/... -v -count 1 -parallel 20 -run='TestAccDirectConnectRouterConfigurationDataSource_'  -timeout 180m
=== RUN   TestAccDirectConnectRouterConfigurationDataSource_basic
    router_configuration_data_source_test.go:17: Environment variable VIRTUAL_INTERFACE_ID is not set
--- SKIP: TestAccDirectConnectRouterConfigurationDataSource_basic (0.00s)
PASS
ok  	github.com/hashicorp/terraform-provider-aws/internal/service/directconnect	4.891s

[ewbankkit]

@schuylr Thanks for the contribution 🎉 👏.

[github-actions]

This functionality has been released in v4.37.0 of the Terraform AWS Provider. Please see the Terraform documentation on provider versioning or reach out if you need any assistance upgrading.

For further feature requests or bug reports with this functionality, please create a new GitHub issue following the template. Thank you!

[github-actions]

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