[Storage] Support 2021-02-01 and upgrade to 20.0.0

[blueww]

All SDK Contribution checklist:

swagger PR merged: Azure/azure-rest-api-specs#13550

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Testing Guidelines

• Pull request includes test coverage for the included changes.

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• The generate.cmd file for the SDK has been updated with the version of AutoRest, as well as the commitid of your swagger spec or link to the swagger spec, used to generate the code. (Track 2 only)
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Additional management plane SDK specific contribution checklist:

Note: Only applies to Microsoft.Azure.Management.[RP] or Azure.ResourceManager.[RP]

• Include updated management metadata.
• Update AzureRP.props to add/remove version info to maintain up to date API versions.

Management plane SDK Troubleshooting

• If this is very first SDK for a services and you are adding new service folders directly under /SDK, please add new service label and/or contact assigned reviewer.
• If the check fails at the Verify Code Generation step, please ensure:
  • Do not modify any code in generated folders.
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    Please pay attention to the @microsoft.csharp version output after running generate.ps1. If it is lower than current released version (2.3.82), please run it again as it should pull down the latest version,

Old outstanding PR cleanup

Please note:
If PRs (including draft) has been out for more than 60 days and there are no responses from our query or followups, they will be closed to maintain a concise list for our reviewers.

[YalinLi0312]

Hi @blueww , could you fix the errors in ci checks?

[blueww]

The error looks like a network error on download nuget package in build.
Will rerun the CI

/Users/runner/hostedtoolcache/dotnet/sdk/5.0.200/NuGet.targets(131,5): error : Failed to download package 'Microsoft.AspNetCore.Authorization.Policy.2.1.0' from 'https://api.nuget.org/v3-flatcontainer/microsoft.aspnetcore.authorization.policy/2.1.0/microsoft.aspnetcore.authorization.policy.2.1.0.nupkg'. [/Users/runner/work/1/s/eng/service.proj]
/Users/runner/hostedtoolcache/dotnet/sdk/5.0.200/NuGet.targets(131,5): error : The HTTP request to 'GET https://api.nuget.org/v3-flatcontainer/microsoft.aspnetcore.authorization.policy/2.1.0/microsoft.aspnetcore.authorization.policy.2.1.0.nupkg' has timed out after 100000ms. [/Users/runner/work/1/s/eng/service.proj]
/Users/runner/hostedtoolcache/dotnet/sdk/5.0.200/NuGet.targets(131,5): error : The feed 'nuget.org [https://api.nuget.org/v3/index.json]' lists package 'Microsoft.AspNetCore.Authorization.Policy.2.1.0' but multiple attempts to download the nupkg have failed. The feed is either invalid or required packages were removed while the current operation was in progress. Verify the package exists on the feed and try again. [/Users/runner/work/1/s/eng/service.proj]
/Users/runner/hostedtoolcache/dotnet/sdk/5.0.200/NuGet.targets(131,5): error : Unable to find package 'Microsoft.AspNetCore.Authorization.Policy.2.1.0'. [/Users/runner/work/1/s/eng/service.proj]

[blueww]

/azp run

[azure-pipelines]

You have several pipelines (over 10) configured to build pull requests in this repository. Specify which pipelines you would like to run by using /azp run [pipelines] command. You can specify multiple pipelines using a comma separated list.

[blueww]

@YalinLi0312

The only CI failure is not valid:

The failure is on verify generated code, error is "Discrepancy detected between generated code in PR and reference generation." But I have not change the code after generate it.

Since autorest issue Azure/autorest.csharp#885, (.net SDK code should skip validate optional properties if it's null), generate .net SRP SDK code must use --use:@microsoft.azure/autorest.csharp@2.3.90 now, and I have added it into generate.ps1.

But the code generated by CI will always check the optional properties no matter it's null or not, so the CI generated code seems not right. It seems CI don't generate SDK code use the correct autorest version, so it might not use generate.ps1 correctly.

Besides that, the failure also occur in before PR #18844 which is already merged.
Please help to review and merged this PR if no other comments.
And please help to fix the CI failure by using correct autorest version, to avoid it fail again in the future PR.