Add more config for parsers

[lanphan]

Hi,
This PR provide a convenient way for user to customize parameters for Auth Header parser (header + prefix).
In addition, I did group all configurations for parsers under main group 'parsers'.

All testcases are passed.

[eschricker]

Hi,
due to the inactivity of the project, we have forked the repository (https://github.com/PHP-Open-Source-Saver/jwt-auth). Currently we are going through the PR and identify which are relevant for us. It would be great if you would recreate your PR in our repository.