chore: introduce Knip as dead-code removal tool (#6368)

* Add knip with inital config

* Rename vite.config.js → vite.config.js (`__dirname` not in ESM scope)

* chore: upgrade to knip v3

* chore(knip): remove duplicate exports

* chore(knip): remove unused types from query devtools

* chore(knip): do not export unused types

* chore(knip): run knip in ci

* chore(knip): ignore certain .d.ts files

* chore(knip): remove unused file

* chore(knip): use devtools in next integration

so the dependency doesn't show up as unused

* chore(knip): remove unused dependencies

* chore(knip): remove unused exports

* chore(knip): add unlisted dependencies

* chore(knip): remove unnecessary scope-manager dependency

* Update knip to 3.3.0

* Update knip to 3.3.1

* chore: ignore custom deps, remove unneeded file

* chore: remove unused util

* chore: remove esbuild dep as it's not directly used

* chore: bump tsup to match esbuild types with the plugin

* chore: remove unused peer deps

* chore: remove unneeded deps

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Co-authored-by: Dominik Dorfmeister <office@dorfmeister.cc>
Co-authored-by: Damian Osipiuk <osipiukd+git@gmail.com>