feat(apig): import api_gateway and apig (Dedicated api_gateway) resource…

[Zhukun-Huawei]

What this PR does / why we need it: add resource api_gateway_environment resource for flexibleengine 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

• [x] Tests added/passed.
• [x] Documentation updated. Schema updated.

Acceptance Steps Performed

api-gateway-environment
=== RUN   TestAccEnvironment_basic
=== PAUSE TestAccEnvironment_basic
=== CONT  TestAccEnvironment_basic
--- PASS: TestAccEnvironment_basic (162.50s)
PASS
coverage: 1.7% of statements in ../../../terraform-provider-flexibleengine/...

apig-acl-policy
=== RUN   TestAccAclPolicy_basic
=== PAUSE TestAccAclPolicy_basic
=== CONT  TestAccAclPolicy_basic
--- PASS: TestAccAclPolicy_basic (632.02s)
PASS
coverage: 2.1% of statements in ../../../terraform-provider-flexibleengine/...

apig-acl-policy-associate
=== RUN   TestAccAclPolicyAssociate_basic
=== PAUSE TestAccAclPolicyAssociate_basic
=== CONT  TestAccAclPolicyAssociate_basic
--- PASS: TestAccAclPolicyAssociate_basic (793.73s)
PASS
coverage: 3.8% of statements in ../../../terraform-provider-flexibleengine/...

apig-channel
=== RUN   TestAccChannel_basic
=== PAUSE TestAccChannel_basic
=== CONT  TestAccChannel_basic
--- PASS: TestAccChannel_basic (664.47s)
PASS
coverage: 4.0% of statements in ../../../terraform-provider-flexibleengine/...

apig-instance-routes
=== RUN   TestAccInstanceRoutes_basic
=== PAUSE TestAccInstanceRoutes_basic
=== CONT  TestAccInstanceRoutes_basic
--- PASS: TestAccInstanceRoutes_basic (544.33s)
PASS
coverage: 2.1% of statements in ../../../terraform-provider-flexibleengine/...

注：

api-acl-policy 这个资源的API文档无domain_id这个枚举值，单测也跑不通所以在本pr中去掉了这个枚举

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[chengxiangdong]

pls resolve the conflicts

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[Zhukun-Huawei]

pls resolve the conflicts

done, i have rebased

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[Zippo-Wang]

/lgtm

[chengxiangdong]

/lgtm cancel

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[chengxiangdong]

/lgtm /approve

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