PoC: Super simple Plugin Framework data source self-registration

[ewbankkit]

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Relates #26027.
Relates #25715.
Relates #25606.

Introduces a naive self-registration mechanism for data sources implemented using Terraform Plugin Framework.
The ideas can be extended to resources implemented using Terraform Plugin Framework and resources and data sources implemented using Terraform Plugin SDK v2.

• In internal/intf (package name up for discussion), two interfaces ServiceData and ProviderData are defined (type names up for discussion). ProviderData is the interface implemented by the (primary) provider's Meta value (currently conns.AWSClient). ServiceData is implemented by a structure defined in each service package.
• In the internal/service/meta package a structure implementing intf.ServiceData is defined. It implements a very simple registry that can be added to in init methods. In future this can be generated for each service package.
• The conns.AWSClient structure is modified to implement intf.ProviderData, including returning a map of intf.ServiceDatas.
• The (primary) Terraform Plugin SDK v2 provider's initialization and configuration have been rejigged slightly so that an initialized, but unconfigured until ConfigureContextFunc is called, conns.AWSClient is available (via the intf.ProviderData) for the Terraform Plugin Framework provider to use.
• The Terraform Plugin Framework provider uses the intf.ProviderData passed during initialization to build the data source (and in future resource) maps returned to Terraform core.

[ewbankkit]

% make testacc TESTARGS='-run=TestAccMetaARNDataSource_' PKG=meta ACCTEST_PARALLELISM=2
==> Checking that code complies with gofmt requirements...
TF_ACC=1 go test ./internal/service/meta/... -v -count 1 -parallel 2  -run=TestAccMetaARNDataSource_ -timeout 180m
=== RUN   TestAccMetaARNDataSource_basic
=== PAUSE TestAccMetaARNDataSource_basic
=== RUN   TestAccMetaARNDataSource_s3Bucket
=== PAUSE TestAccMetaARNDataSource_s3Bucket
=== CONT  TestAccMetaARNDataSource_basic
=== CONT  TestAccMetaARNDataSource_s3Bucket
--- PASS: TestAccMetaARNDataSource_basic (13.63s)
--- PASS: TestAccMetaARNDataSource_s3Bucket (13.84s)
PASS
ok  	github.com/hashicorp/terraform-provider-aws/internal/service/meta	18.027s
% make testacc TESTARGS='-run=TestAccMediaLive_serial/MultiplexProgram' PKG=medialive
==> Checking that code complies with gofmt requirements...
TF_ACC=1 go test ./internal/service/medialive/... -v -count 1 -parallel 20  -run=TestAccMediaLive_serial/MultiplexProgram -timeout 180m
=== RUN   TestAccMediaLive_serial
=== RUN   TestAccMediaLive_serial/MultiplexProgram
=== RUN   TestAccMediaLive_serial/MultiplexProgram/basic
=== RUN   TestAccMediaLive_serial/MultiplexProgram/disappears
--- PASS: TestAccMediaLive_serial (119.57s)
    --- PASS: TestAccMediaLive_serial/MultiplexProgram (119.57s)
        --- PASS: TestAccMediaLive_serial/MultiplexProgram/basic (62.74s)
        --- PASS: TestAccMediaLive_serial/MultiplexProgram/disappears (56.83s)
PASS
ok  	github.com/hashicorp/terraform-provider-aws/internal/service/medialive	123.758s
% make testacc TESTARGS='-run=TestAccVPC_basic' PKG=ec2
==> Checking that code complies with gofmt requirements...
TF_ACC=1 go test ./internal/service/ec2/... -v -count 1 -parallel 20  -run=TestAccVPC_basic -timeout 180m
=== RUN   TestAccVPC_basic
=== PAUSE TestAccVPC_basic
=== CONT  TestAccVPC_basic
--- PASS: TestAccVPC_basic (21.14s)
PASS
ok  	github.com/hashicorp/terraform-provider-aws/internal/service/ec2	25.347s

[github-actions]

This functionality has been released in v4.31.0 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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