Add blocklist and allowlist for oidc domains

[jawabuu]

This introduces 2 variables
OIDC_DOMAIN_BLOCKLIST
OIDC_DOMAIN_ALLOWLIST
to filter out which email domains are allowed to login when using SSO.
Related issue
#27
It is possible to do away entirely with these new variables if equivalent setting for domains can be found. However, this seems not to be available.
getsentry/self-hosted#2894

[jawabuu]

@max-wittig @ercanucan I have tried as much as possible to keep with your philosophy of keeping the codebase as close as possible to upstream.
The changes made are all opt-in via the 2 env-variables and do not change existing behaviour before the PR.
I also have created a branch from v4.0.1 for compatibility/backporting with the latest release
https://github.com/jawabuu/sentry-auth-oidc/tree/filter-domains-v4.0.1
and this can be merged to existing latest version.

[max-wittig]

Sorry I totally missed your MR. Didn't get any notifications for it. Will take a look in the next few days!

[max-wittig]

Thanks for the MR. Just some suggestions added

[max-wittig]

Regarding your commit messages. Could you please ensure that these comply with the conventional changelog? Thanks 👍

[jawabuu]

Thanks @max-wittig I'll address these immediately.

[dlouzan]

@max-wittig Would we want to take another look at this now that builds are fixed again?

/cc @nejch