feat: support for B2B SSO

[hperl]

Related issue(s)

Checklist

• I have read the contributing guidelines.
• I have referenced an issue containing the design document if my change
  introduces a new feature.
• I am following the
  contributing code guidelines.
• I have read the security policy.
• I confirm that this pull request does not address a security
  vulnerability. If this pull request addresses a security vulnerability, I
  confirm that I got the approval (please contact
  [email protected]) from the maintainers to push
  the changes.
• I have added tests that prove my fix is effective or that my feature
  works.
• I have added or changed the documentation.

Further Comments

[codecov]

Codecov Report

Merging #3489 (c737c40) into master (4c34c24) will decrease coverage by 0.15%.
Report is 1 commits behind head on master.
The diff coverage is 60.33%.

❗ Current head c737c40 differs from pull request most recent head 06c879f. Consider uploading reports for the commit 06c879f to get more accurate results

@@            Coverage Diff             @@
##           master    #3489      +/-   ##
==========================================
- Coverage   78.34%   78.19%   -0.15%     
==========================================
  Files         341      341              
  Lines       22691    22754      +63     
==========================================
+ Hits        17777    17793      +16     
- Misses       3586     3623      +37     
- Partials     1328     1338      +10     

Files Changed	Coverage Δ
driver/registry.go	34.21% <0.00%> (-6.42%)	⬇️
selfservice/flow/login/flow.go	97.70% <ø> (ø)
selfservice/flow/login/strategy.go	80.00% <ø> (ø)
selfservice/flow/registration/flow.go	100.00% <ø> (ø)
selfservice/flow/registration/strategy.go	80.00% <ø> (ø)
selfservice/strategy/oidc/provider_apple.go	37.93% <ø> (ø)
selfservice/strategy/oidc/provider_auth0.go	72.30% <ø> (ø)
selfservice/strategy/oidc/provider_dingtalk.go	31.52% <ø> (ø)
selfservice/strategy/oidc/provider_discord.go	0.00% <ø> (ø)
selfservice/strategy/oidc/provider_facebook.go	83.56% <ø> (ø)
... and 33 more

... and 1 file with indirect coverage changes

[aeneasr]

Looking good! I think the dependency injection is overengineered. I would recommend either implementing a Set function or making the member public.