fix: plugin behavior with vite build --watch

- add watched files with rollup's PluginContext.addWatchFile()
- support cleaning up state (result + emitter variables)
when closing bundle so other builds can happen (build --watch)
- bump vite dep to 2.7.0 to get access to config.build.watch - just
for types, but hey 2.7.0 is old now - bumped minor to 0.4.0 because of
it

package.json

@@ -1,6 +1,6 @@
 {
   "name": "vite-plugin-bundled-entry",
-  "version": "0.3.1",
+  "version": "0.4.0",
   "main": "dist/index.js",
   "module": "dist/index.mjs",
   "types": "dist/index.d.ts",
@@ -35,12 +35,12 @@
     "@types/node": "^16.11.11",
     "tsup": "^5.7.1",
     "typescript": "^4.4.4",
-    "vite": "^2.0.2"
+    "vite": "~2.7.0"
   },
   "dependencies": {
     "esbuild": "^0.14.10"
   },
   "peerDependencies": {
-    "vite": "^2.0.2"
+    "vite": "~2.7.0"
   }
 }