Add provider_name getter in Credentials impl

[GJason88]

Describe the feature

Add a new provider_name method that returns the provider name of a Credentials instance.

Use Case

It would be useful to be able to get the provider name of the credentials directly rather than hardcoding it. For example, in the case of a custom credentials provider building a new Credentials from an existing one.

Proposed Solution

No response

Other Information

No response

Acknowledgements

• I may be able to implement this feature request
• This feature might incur a breaking change

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