Add support for validating the org_name claim [SDK-4414]

[Widcket]

• All new/changed/fixed functionality is covered by tests (or N/A)
• I have added documentation for all new/changed functionality (or N/A)

📋 Changes

This PR adds a new ID token claim validator, IDTokenOrgNameValidator, which is only used if the organization value passed on login does not start with org_ (meaning, it's not an organization ID). Otherwise, the existing IDTokenOrgIDValidator is used instead.

🎯 Testing

Besides adding unit tests, the changes were tested manually using a simulator running iOS 17.0, with Xcode 14.3 (14E222b).

[stevehobbsdev]

LGTM - anything we want to update in EXAMPLES.md around Organizations? e.g. the sample in there refers to YOUR_AUTH0_ORGANIZATION_ID specifically, I've seen others change similar examples to something like YOUR_AUTH0_ORGANIZATION_ID_OR_NAME.

[Widcket]

@stevehobbsdev Good catch! Added it in e7263c3