feat: add pacman-common/pacman-server crates

pacman-server/README.md

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+# pacman-server
+
+Despite the naming of this crate, it's not a server for the Pac-Man game allowing multiplayer or anything super interesting.
+
+This crate is a webserver that hosts an OAuth login and leaderboard API for the main `pacman` crate to hook into.
+
+## Features
+
+- [ ] Axum Webserver
+- [ ] Database
+- [ ] OAuth
+  - [ ] Discord
+  - [ ] GitHub
+  - [ ] Google (?)
+- [ ] Leaderboard API
+- [ ] Name Restrictions & Flagging
+- [ ] Avatars
+  - [ ] 8-bit Conversion
+  - [ ] Storage?
+- [ ] Common Server/Client Crate
+- [ ] CI/CD & Tests