[refactor] merge MobX observer() into Core package

[refactor] replace Props watch() with MobX observable()
[migrate] move Utility methods to Web Utility package
[remove] Shadow DOM CSS injection & Class State
[optimize] upgrade Upstream packages & simplify Configuration files

Author: TechQuery

.eslintrc.json

@@ -22,6 +22,7 @@
         "no-var": "off",
         "no-unused-vars": "warn",
         "no-undef": "warn",
+        "@typescript-eslint/ban-ts-comment": "warn",
         "@typescript-eslint/ban-types": "warn",
         "@typescript-eslint/no-namespace": "warn",
         "@typescript-eslint/explicit-module-boundary-types": "off"