Add support Private Link setting for AWS Tranfer for SFTP Service

[teraken0509]

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Fixes #8105

Changes proposed in this pull request:

• Add Private Link Support for AWS Transfer service.

Output from acceptance testing:

$ make testacc TEST=./aws TESTARGS='-run=TestAccAWSTransferServer_'
==> Checking that code complies with gofmt requirements...
TF_ACC=1 go test ./aws -v -parallel 20 -run=TestAccAWSTransferServer_ -timeout 120m
=== RUN   TestAccAWSTransferServer_basic
=== PAUSE TestAccAWSTransferServer_basic
=== RUN   TestAccAWSTransferServer_apigateway
=== PAUSE TestAccAWSTransferServer_apigateway
=== RUN   TestAccAWSTransferServer_disappears
=== PAUSE TestAccAWSTransferServer_disappears
=== RUN   TestAccAWSTransferServer_forcedestroy
=== PAUSE TestAccAWSTransferServer_forcedestroy
=== RUN   TestAccAWSTransferServer_vpcEndpointId
=== PAUSE TestAccAWSTransferServer_vpcEndpointId
=== CONT  TestAccAWSTransferServer_basic
=== CONT  TestAccAWSTransferServer_forcedestroy
=== CONT  TestAccAWSTransferServer_vpcEndpointId
=== CONT  TestAccAWSTransferServer_disappears
=== CONT  TestAccAWSTransferServer_apigateway
--- PASS: TestAccAWSTransferServer_disappears (24.45s)
--- PASS: TestAccAWSTransferServer_forcedestroy (40.59s)
--- PASS: TestAccAWSTransferServer_apigateway (41.64s)
--- PASS: TestAccAWSTransferServer_basic (58.41s)
--- PASS: TestAccAWSTransferServer_vpcEndpointId (80.30s)
PASS
ok  	github.com/terraform-providers/terraform-provider-aws/aws	80.376s

[bflad]

LGTM, thanks @kterada0509 🚀

--- PASS: TestAccAWSTransferServer_disappears (5.83s)
--- PASS: TestAccAWSTransferServer_apigateway (10.05s)
--- PASS: TestAccAWSTransferServer_forcedestroy (11.05s)
--- PASS: TestAccAWSTransferServer_basic (15.48s)
--- PASS: TestAccAWSTransferServer_vpcEndpointId (32.34s)

[bflad]

Nit: This can be simplified with the below but certainly not worth holding up this pull request for:

ValidateFunc: validation.StringMatch(regexp.MustCompile(`^vpce-[0-9a-f]{17}$`), "must match VPC Endpoint identifier beginning with vpce-"),

[bflad]

This has been released in version 2.6.0 of the Terraform AWS provider. Please see the Terraform documentation on provider versioning or reach out if you need any assistance upgrading.

[ghost]

I'm going to lock this issue because it has been closed for 30 days ⏳. This helps our maintainers find and focus on the active issues.

If you feel this issue should be reopened, we encourage creating a new issue linking back to this one for added context. Thanks!