Migrate to bun test

[molefrog]

• All tests are powered by bun test now
• Type tests via bun run test-types now work properly (launches tsc over .ts/.tsx files in test/ folders)
• Vite and Vitest are removed
• No build step, no rollup
• Single global tsconfig.json instead of per-package ones

Some stats

• -6 config files
• -10 dev dependencies
• GH action time 30s → 16s
• tests run 7.42s → 400ms

[bolt-new-by-stackblitz]

Run & review this pull request in StackBlitz Codeflow.

[github-actions]

size-limit report 📦

Path	Size
packages/wouter/esm/index.js	0 B (-100% 🔽)
packages/wouter/esm/use-browser-location.js	0 B (-100% 🔽)
packages/wouter/esm/memory-location.js	0 B (-100% 🔽)
packages/wouter/esm/use-hash-location.js	0 B (-100% 🔽)
packages/wouter-preact/esm/index.js	0 B (-100% 🔽)
packages/wouter-preact/esm/use-browser-location.js	0 B (-100% 🔽)
packages/wouter-preact/esm/use-hash-location.js	0 B (-100% 🔽)
packages/wouter-preact/esm/memory-location.js	0 B (-100% 🔽)
packages/wouter/src/index.js	2.19 KB (+100% 🔺)
packages/wouter/src/use-browser-location.js	526 B (+100% 🔺)
packages/wouter/src/memory-location.js	799 B (+100% 🔺)
packages/wouter/src/use-hash-location.js	732 B (+100% 🔺)
packages/wouter-preact/src/index.js	2.08 KB (+100% 🔺)
packages/wouter-preact/src/use-browser-location.js	456 B (+100% 🔺)
packages/wouter-preact/src/use-hash-location.js	660 B (+100% 🔺)
packages/wouter-preact/src/memory-location.js	721 B (+100% 🔺)