Add pre-commit plugin .js files compiling and building (software-mans…

…ion#4326)

## Summary

If you forgor to build the plugin it will do it for you. But pls don't
forgor.

## Test plan

Forgor on purpose and see angry message.

.husky/pre-commit

@@ -3,3 +3,19 @@
 
 yarn lint-staged
 yarn type:check
+
+# This automatically builds Reanimated Babel plugin JavaScript files if their
+# TypeScript counterparts were changed. It also adds those files to the commit
+# if those built files differ from currently committed ones.
+! git diff-index HEAD --name-only |\
+grep -E '^plugin/' > /dev/null
+if [ $? -eq 1 ]; then
+  yarn plugin
+  ! git status -u |\
+  grep -E 'plugin/build/plugin\.js|plugin/build/plugin\.js\.map' > /dev/null
+  if [ $? -eq 1 ]; then
+    git add plugin/build/plugin.js plugin/build/plugin.js.map
+    echo "[Reanimated] Plugin files were automatically built and changes were spotted.\
+    \n             Those changes were added to the commit." >&2
+  fi
+fi