Updated library to support additional JWT headers and signature encodings …

[damion-add-on-depot]

…for Service Account authorization.

Some Service Account implementations (such as Box.com) require additional JWT headers and signature encodings (for example, encodings for encrypted private keys that require a passphrase) not currently supported by this library.

This pull request addresses that limitation.

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[damion-add-on-depot]

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[joelmiles]

I'd love to see this get merged and released, as I also have a use case requiring an additional JWT header. To the repo maintainers: any idea on when that could happen?