Rename JwtPresentation to Presentation

[abdulmth]

Description of change

Since JwtPrsentation is not generic and not tied to JWT, it's now renamed to Presentation.

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• Bug fix (a non-breaking change which fixes an issue)
• Enhancement (a non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Documentation Fix

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[PhilippGackstatter]

Nit:

• There are five instances of new JwtCredentialValidationOptions({}) in this and other examples that you could rewrite to new JwtCredentialValidationOptions(). Search for ({}) in the examples directory.
• And we can rewrite all instances of JwtCredentialValidationOptions.default() to new JwtCredentialValidationOptions() as well in the examples.

We could consider removing the default method on {JwtCredentialValidationOptions, JwtPresentationValidationOptions, JwtPresentationOptions} and make the new-style pattern the default.

(Feel free to do in another PR as well, I just looked it up now and wanted to write it down.)