Add option to configure Azure Service Token Provider for Key Vault check

[DaleMittleman]

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Giving the developer the opportunity to provide connection string and azure AD instance parameters for the Azure Service Token Provider used by the Key Vault Client

[unaizorrilla]

Hi @DaleMittleman I like the PR, let me a couple of days in order to review and merge ( i start my vacation right now)

[hansmbakker]

@unaizorrilla @Xabaril this PR is required to be able to connect to KeyVaults using a User Assigned Identity (instead of a System Assigned Identity) since that requires using a connection string.

Is there a chance that you will publish an update to the NuGet package using this PR?

CC @remcorakers

[sungam3r]

@DaleMittleman Please rebase onto master if you are going to continue work on this PR.

[sungam3r]

ping @DaleMittleman

[sungam3r]

@DaleMittleman Do you intend to continue working on that PR?

[sungam3r]

@marioleed Maybe you can help with this? You posted PRs for Azure Service Bus project. I think that you may be familiar with Azure Key Vault as well.

[marioleed]

@sungam3r Latest code is using a TokenCredential, so I don't think this PR's changes should be used anymore. Should probably close it.

[sungam3r]

OK.

Closed due to lack of feedback from @DaleMittleman .