feat(workspace/warehouse_app): add resource to manage warehouse application

[wuzhuanhong]

What this PR does / why we need it:

Add a new resource used to add application to Workspace app warehouse.

Which issue this PR fixes:
(optional, in fixes #<issue number>(, fixes #<issue_number>, ...) format, will close that issue when PR gets merged)
fixes #xxx

Special notes for your reviewer:

Release note:

1. add new resource to manage application.
2. add related document, environmentvariable and acceptance test.

PR Checklist

• Tests added/passed.

./scripts/coverage.sh -o workspace -f TestAccAppWarehouseApp_basic
Prepare to calculate the coverage the following command:
TF_ACC=1 go test "./huaweicloud/services/acceptance/workspace" -v -coverprofile="./huaweicloud/services/acceptance/workspace/workspace_coverage.cov" -coverpkg="./huaweicloud/services/workspace" -run TestAccAppWarehouseApp_basic -timeout 360m -parallel 10
=== RUN   TestAccAppWarehouseApp_basic
=== PAUSE TestAccAppWarehouseApp_basic
=== CONT  TestAccAppWarehouseApp_basic
--- PASS: TestAccAppWarehouseApp_basic (34.29s)
PASS
coverage: 5.2% of statements in ./huaweicloud/services/workspace
ok      github.com/huaweicloud/terraform-provider-huaweicloud/huaweicloud/services/acceptance/workspace 34.487s coverage: 5.2% of statements in ./huaweicloud/services/workspace

• Documentation updated.

• Schema updated.

• CheckDeleted.

  • a. During query operation (Read Context)
    aa. Resource not found
    

  • b. During delete/disassociate/unbind operation (Delete Context)
    ba. Resource not found
    >>>>>> Paste the screenshot here <<<<<<

[Lance52259]

Suggested change

	Use this resource to add a application to Workspace APP warehouse within HuaweiCloud.
	Manages an application resource of Workspace APP warehouse within HuaweiCloud.

[wuzhuanhong]

./scripts/coverage.sh -o workspace -f TestAccAppWarehouseApp_basic
Prepare to calculate the coverage the following command:
TF_ACC=1 go test "./huaweicloud/services/acceptance/workspace" -v -coverprofile="./huaweicloud/services/acceptance/workspace/workspace_coverage.cov" -coverpkg="./huaweicloud/services/workspace" -run TestAccAppWarehouseApp_basic -timeout 360m -parallel 10
=== RUN TestAccAppWarehouseApp_basic
=== PAUSE TestAccAppWarehouseApp_basic
=== CONT TestAccAppWarehouseApp_basic
--- PASS: TestAccAppWarehouseApp_basic (31.51s)
PASS
coverage: 5.2% of statements in ./huaweicloud/services/workspace
ok github.com/huaweicloud/terraform-provider-huaweicloud/huaweicloud/services/acceptance/workspace 31.582s coverage: 5.2% of statements in ./huaweicloud/services/workspace

[Lance52259]

/approve
/lgtm

[github-ci-robot]

This PR has been approved by: @Lance52259

/approve
/lgtm