[FEATURE] Made response_type parameter configurable

[peterkeijsers]

I hade trouble connecting to Azure Active Rirectory B2C. That required changing the response_type from "code" to "code id_token token". By making this parameter configurable, the flexibility of the plugin increases.

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[weilai-irl]

Hi @peterkeijsers,

Thank you for submitting the PR.

We cannot merge this into release as is unfortunately for two main reasons:

• All PRs needs to be made to the main repository at https://github.com/microsoft/o365-moodle. This repository is only used for integration with Moodle plugin repository (https://moodle.org/plugins/) for release of plugins on the Moodle end. No active development is performed in this repo.
• From our experience, allowing Moodle site admins to configure the "response type" as text field is going to cause more confusion than solving problems. A viable option is to convert the configuration setting to a dropdown list, with each possible response type as an option.

On a side note, please keep version file increment minimal, i.e. only add 1 to the last two digits. The first 8 digits should match the counterpart of the the main Moodle version number. This is a rule made locally within the Microsoft plugins, and doesn't apply elsewhere.

If you want, please feel free to convert your PR according to the suggestions above and submit a PR in the main repo. Note that any change made for Azure AD B2C needs to work for normal Azure AD too, as most of users don't have B2C. On receiving the PR, we will arrange testing and once passed, it will be included in the next release. Alternatively you can submit a feature request (as an issue) in the main repo, and it will be processed accordingly.

Regards,
Lai