feat: Add auth callbacks, types, exports,and README to backend package

[ryangilbert]

Linked issue/ticket

Description

Adds authentication features for a basic email/password login/registration flow to the backend package. These are designed to work with a new SolidStart application.

Checklist

• I've followed the Contributing guidelines
• I've titled my PR according to the Conventional Commits spec
• I've added tests that fail without this PR but pass with it
• I've linted, tested, and commented my code
• I've updated documentation (if appropriate)

[socket-security]

New and removed dependencies detected. Learn more about Socket for GitHub ↗︎

Package	New capabilities	Transitives	Size	Publisher
npm/[email protected]	None	0	873 kB	ryansolid
npm/[email protected]	Transitive: environment, eval, filesystem, network, shell, unsafe	+339	319 MB	nksaraf
npm/[email protected]	Transitive: environment, filesystem	+22	49.7 MB	antfu, patak, soda, ...2 more

🚮 Removed packages: npm/@types/[email protected], npm/@types/[email protected], npm/@types/[email protected], npm/@typescript-eslint/[email protected], npm/@typescript-eslint/[email protected], npm/[email protected], npm/[email protected], npm/[email protected], npm/[email protected], npm/[email protected], npm/[email protected], npm/[email protected]

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