add extension metadata V2 APIs and examples

[jiaqi-beep]

ARM (Control Plane) API Specification Update Pull Request

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Purpose of this PR

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• New resource provider.
• New API version for an existing resource provider. (If API spec is not defined in TypeSpec, the PR should have been created in adherence to OpenAPI specs PR creation guidance).
• Update existing version for a new feature. (This is applicable only when you are revising a private preview API version.)
• Update existing version to fix OpenAPI spec quality issues in S360.
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  • edit this with your clarification

Due diligence checklist

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and followed the instructions by checking all the boxes:

• I confirm this PR is modifying Azure Resource Manager (ARM) related specifications, and not data plane related specifications.
• I have reviewed following Resource Provider guidelines, including
  ARM resource provider contract and
  REST guidelines (estimated time: 4 hours).
  I understand this is required before I can proceed to the diagram Step 2, "ARM API changes review", for this PR.

Additional information

Viewing API changes

For convenient view of the API changes made by this PR, refer to the URLs provided in the table
in the Generated ApiView comment added to this PR. You can use ApiView to show API versions diff.

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[openapi-pipeline-app]

Next Steps to Merge

Next steps that must be taken to merge this PR:

• ❌ This PR is in purview of the ARM review (label: ARMReview). This PR must get ARMSignedOff label from an ARM reviewer.
  This PR is awaiting ARM reviewer feedback (label: WaitForARMFeedback).
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[openapi-pipeline-app]

Generated ApiView

Language	Package Name	ApiView Link
JavaScript	@azure/arm-hybridcompute	https://apiview.dev/Assemblies/Review/bd79793b6b53409d8de21847c605dc64?revisionId=90c082433c314c489361930e6eb9fc13
Go	sdk/resourcemanager/hybridcompute/armhybridcompute	https://apiview.dev/Assemblies/Review/cc99eb4c91204d199d8e40aed71bc06e?revisionId=219db1285d86440798b7852b94359fea
.Net	Azure.ResourceManager.HybridCompute	There is no API change compared with the previous version
Java	azure-resourcemanager-hybridcompute	https://apiview.dev/Assemblies/Review/b79886348ebe497b9ddc99d286cb6e99?revisionId=3d9b719d7f8b4a36aca969d78d5ff109
Python	azure-mgmt-hybridcompute	https://apiview.dev/Assemblies/Review/4d8650fb76954c6ba3f15e1781007dd9?revisionId=9d0cb2e7e97b40988b35f4291488b83d

[jiaqi-beep]

This change already approved #30656, but we decided to move this to a new preview version

[jiaqi-beep]

previously approved in #30656