Parses provider from user_id if identities is not provided.

[kertof]

Description

If the data from Auth0 does not contain identities, parse the 'provider' from the user_id, which has the provider in it.

This change also has formatting updates, removes whitespace.

References

Closes #102

Testing

• This change adds test coverage for new/changed/fixed functionality

Checklist

• I have added documentation for new/changed functionality in this PR or in auth0.com/docs
• All active GitHub checks for tests, formatting, and security are passing
• The correct base branch is being used, if not master

[joshcanhelp]

@kertof - Appreciate the contribution here! I have a few suggestions and would like to see this without any whitespace changes so the core functionality changes are clear.

Thank you!

[kertof]

I've reverted the whitespace changes. Let me know what you think.
For the fixtures, I reused the ones already there, the expected values are hard-coded in userprofile.tests.js.

[joshcanhelp]

Looks great @kertof, appreciate the work here 🙇