feat: add microsoft provider

[JamieMagee]

- Summary

Fixes #216

NOTE: It's not possible to get an avatar URL, only the actual binary data for the avatar.

Useful documentation:

• https://docs.microsoft.com/en-us/azure/active-directory/develop/v2-permissions-and-consent
• https://docs.microsoft.com/en-us/azure/active-directory/develop/active-directory-v2-protocols#endpoints
• https://docs.microsoft.com/en-gb/graph/api/user-get?view=graph-rest-1.0&tabs=http
• https://developer.microsoft.com/en-us/graph/graph-explorer/preview

- Test plan

Still TODO. Not 100% sure how to test this, and would appreciate any input here

- Description for the changelog

Initial implementation of Microsoft identity provider

- A picture of a cute animal (not mandatory but encouraged)

[JamieMagee]

@kitop @mraerino Can I get this reviewed? Or if not you, who should I ping about this?

[mraerino]

hey, we don't have a lot of bandwidth on the team for this right now.

I noticed there are no tests. can you add some?

[JamieMagee]

@kitop @mraerino If I rebase this, do you have bandwidth to review it?

[tlsimm]

@kitop I see this is still requiring some approvals - is this something we want still want to support?

[kitop]

This will fall under @rjbeers team, so he should be weighing in.

[tlsimm]

Can this be closed out?

[JamieMagee]

Closing this out. If you want to add this functionality, backport it from the supabase port^1