feat(fgs/function): add new resource for function topping

[Lance52259]

What this PR does / why we need it:
Add a new resource to top the function, there is no limit for function topping currently.

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 for function topping

PR Checklist

• Tests added/passed.

./scripts/coverage.sh -o fgs -f TestAccFunctionTopping_basic
Prepare to calculate the coverage the following command:
TF_ACC=1 go test "./huaweicloud/services/acceptance/fgs" -v -coverprofile="./huaweicloud/services/acceptance/fgs/fgs_coverage.cov" -coverpkg="./huaweicloud/services/fgs" -run TestAccFunctionTopping_basic -timeout 360m -parallel 10
=== RUN   TestAccFunctionTopping_basic
=== PAUSE TestAccFunctionTopping_basic
=== CONT  TestAccFunctionTopping_basic
--- PASS: TestAccFunctionTopping_basic (15.28s)
PASS
coverage: 12.8% of statements in ./huaweicloud/services/fgs
ok      github.com/huaweicloud/terraform-provider-huaweicloud/huaweicloud/services/acceptance/fgs       15.328s coverage: 12.8% of statements in ./huaweicloud/services/fgs

• Documentation updated.

• Schema updated.

• CheckDeleted.

  • a. During query operation (Read Context)
    aa. Resource not found
    >>>>>> Paste the screenshot here <<<<<<

  • 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

[deer-hang]

/lgtm