Lucia v3

[pilcrowonpaper]

See #1253

Database adapters migration

• [x] @lucia-auth/adapter-mongoose
• [x] @lucia-auth/adapter-mysql
• [x] @lucia-auth/adapter-postgresql
• [x] @lucia-auth/adapter-prisma
• [x] @lucia-auth/adapter-sqlite

Session adapters

Won't work on @lucia-auth/adapter-session-unstorage for now

• [x] @lucia-auth/adapter-session-redis

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Deploying with    Cloudflare Pages

Latest commit:	04dd01e
Status:	🚫  Build failed.

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[pilcrowonpaper]

Final checklist:

• [x] Update versions
• [x] Add links to v2 and v3 announcement
• [ ] Delete @beta install instructions from docs
• [x] Create v2 branch