Create a `taco-auth` package

[piotr-roslaniec]

Type of PR:

• Other

Required reviews:

• 2

What this does:

• Creates a new package in the pnpm workspace, taco-auth
• Moves related authentication utilities to taco-auth

Issues fixed/closed:

• Fixes #...

Why it's needed:

• Provides optionality to access different authentication methods

Notes for reviewers:

• SIWE-related changes were moved to #526
• There ae a lot of line changes in this PR that were triggered by the creation of a new package. These changes were triggered by pnpm lint:fix

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