Add AddPersistedGrantStore<T> extension method for IIdentityServerBuilder

[thomaslevesque]

What issue does this PR address?

There are already methods to add most services (IClientStore, IResourceStore, IProfileService, etc.), but not IPersistedGrantStore. There's only AddInMemoryPersistedGrants, which isn't appropriate in many situations (in my case I need to persist refresh tokens).

Does this PR introduce a breaking change?

No

Please check if the PR fulfills these requirements

• The commit follows our guidelines
• Unit Tests for the changes have been added (for bug fixes / features): There are no tests for the existing methods, and a test for this doesn't seem to add much value. I'll add a test anyway if you want me to.

Other information:

N/A

[leastprivilege]

thanks!

[thomaslevesque]

Thanks for the merge!

[lock]

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