feat(auth): introduce EmailOptional config for providers

[issuedat]

Introduces EmailOptional configuration to allow sign-ins/ups when the provider does not return an email address.

Related: supabase/supabase#38788

[coveralls]

Pull Request Test Coverage Report for Build 18130622525

Details

• 1 of 1 (100.0%) changed or added relevant line in 1 file are covered.
• 5 unchanged lines in 1 file lost coverage.
• Overall coverage decreased (-0.02%) to 54.784%

---

Files with Coverage Reduction	New Missed Lines	%
internal/gen/keys/keys.go	5	12.9%

Totals
Change from base Build 18130359431:	-0.02%
Covered Lines:	6390
Relevant Lines:	11664

---

💛 - Coveralls

[sweatybridge]

Looks good. Just need to add the new field to default config.toml as documentation https://github.com/supabase/cli/blob/develop/pkg/config/templates/config.toml#L266

[issuedat]

Thanks @sweatybridge! Just added the config to the template ✅