feat(lts): supports creation host group of 'label' type

[wuzhuanhong]

What this PR does / why we need it:

Provide new parameter agent_access_type and labels for host group resources.

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:

PR Checklist

• Tests added/passed.

./scripts/acc-test.sh
>>> Start to test
=== RUN   TestAccHostGroup_basic
=== PAUSE TestAccHostGroup_basic
=== RUN   TestAccHostGroup_withLabelType
=== PAUSE TestAccHostGroup_withLabelType
=== CONT  TestAccHostGroup_basic
=== CONT  TestAccHostGroup_withLabelType
--- PASS: TestAccHostGroup_withLabelType (58.04s)
--- PASS: TestAccHostGroup_basic (73.75s)
PASS
coverage: 6.5% of statements in ../../lts
ok      github.com/huaweicloud/terraform-provider-huaweicloud/huaweicloud/services/acceptance/lts       73.812s```

* [x] Documentation updated.
* [x] Schema updated.
* [ ] CheckDeleted.

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

    <!-- If the resource depends the parent resource(s), please provide the related check result(s) of the CheckDeleted validation.
    ab. Related resources (parent resources) not found
    \>>>>>> Paste the screenshot here <<<<<<
    -->
  - **b. During delete/disassociate/unbind operation (Delete Context)**
    ba. Resource not found
    \>>>>>> Paste the screenshot here <<<<<<

    <!-- If the resource depends the parent resource(s), please provide the related check result(s) of the CheckDeleted validation.
    bb. Related resources (parent resources) not found
    \>>>>>> Paste the screenshot here <<<<<<
    -->

[Lance52259]

/approve
/lgtm

[github-ci-robot]

This PR has been approved by: @Lance52259

/approve
/lgtm