feat(cae/env): add new resource to manage environments

[Lance52259]

What this PR does / why we need it:
Add new resource support for the environments management.
The resource supports retry when the jobs failed (during create and delete function).

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 support for the environments management.
2. add related document and acceptance tests support.

PR Checklist

• Tests added/passed.

./scripts/coverage.sh -o cae -f TestAccEnvironment_basic
Prepare to calculate the coverage the following command:
TF_ACC=1 go test "./huaweicloud/services/acceptance/cae" -v -coverprofile="./huaweicloud/services/acceptance/cae/cae_coverage.cov" -coverpkg="./huaweicloud/services/cae" -run TestAccEnvironment_basic -timeout 360m -parallel 10
=== RUN   TestAccEnvironment_basic
--- PASS: TestAccEnvironment_basic (507.31s)
PASS
coverage: 22.9% of statements in ./huaweicloud/services/cae
ok      github.com/huaweicloud/terraform-provider-huaweicloud/huaweicloud/services/acceptance/cae       507.378s        coverage: 22.9% of statements in ./huaweicloud/services/cae

• 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
    

[github-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This PR has been approved by: @Lance52259

[github-ci-robot]

This PR needs rebase.

[Lance52259]

./scripts/coverage.sh -o cae -f TestAccEnvironment_basic
Prepare to calculate the coverage the following command:
TF_ACC=1 go test "./huaweicloud/services/acceptance/cae" -v -coverprofile="./huaweicloud/services/acceptance/cae/cae_coverage.cov" -coverpkg="./huaweicloud/services/cae" -run TestAccEnvironment_basic -timeout 360m -parallel 10
=== RUN   TestAccEnvironment_basic
--- PASS: TestAccEnvironment_basic (429.21s)
PASS
coverage: 23.1% of statements in ./huaweicloud/services/cae
ok      github.com/huaweicloud/terraform-provider-huaweicloud/huaweicloud/services/acceptance/cae       429.261s        coverage: 23.1% of statements in ./huaweicloud/services/cae

[Lance52259]

./scripts/coverage.sh -o cae -f TestAccEnvironment_basic
Prepare to calculate the coverage the following command:
TF_ACC=1 go test "./huaweicloud/services/acceptance/cae" -v -coverprofile="./huaweicloud/services/acceptance/cae/cae_coverage.cov" -coverpkg="./huaweicloud/services/cae" -run TestAccEnvironment_basic -timeout 360m -parallel 10
=== RUN   TestAccEnvironment_basic
--- PASS: TestAccEnvironment_basic (430.88s)
PASS
coverage: 20.2% of statements in ./huaweicloud/services/cae
ok      github.com/huaweicloud/terraform-provider-huaweicloud/huaweicloud/services/acceptance/cae       430.964s        coverage: 20.2% of statements in ./huaweicloud/services/cae