Support AnalyticsAccount (Alpha)

[maqiuyujoyce]

BRIEF Change description

Fixes #5334

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[yuwenma]

Please split this PR into the follow sub PRs:

1. crud, log and MockGCP
2. API, Mapper and fuzzer
3. controller (*_identity, *_reference), and fixture tests

[maqiuyujoyce]

Please split this PR into the follow sub PRs:

1. crud, log and MockGCP
2. API, Mapper and fuzzer
3. controller (*_identity, *_reference), and fixture tests

Will split the PR.
Though this resource doesn't have gcloud support so we cannot support script test for it.

[maqiuyujoyce]

Replaced by #5422 #5423 and #5424