Add React and TS to webpacker; add react-rails gem

Gemfile.lock

@@ -88,6 +88,10 @@ GEM
       public_suffix (>= 2.0.2, < 4.0)
     autoprefixer-rails (9.6.1)
       execjs
+    babel-source (5.8.35)
+    babel-transpiler (0.7.0)
+      babel-source (>= 4.0, < 6)
+      execjs (~> 2.0)
     bcrypt (3.1.13)
     bindex (0.8.1)
     bootsnap (1.4.4)
@@ -105,6 +109,7 @@ GEM
     childprocess (1.0.1)
       rake (< 13.0)
     concurrent-ruby (1.1.5)
+    connection_pool (2.2.2)
     crass (1.0.4)
     datetime_picker_rails (0.0.7)
       momentjs-rails (>= 2.8.1)
@@ -200,6 +205,12 @@ GEM
     rb-fsevent (0.10.3)
     rb-inotify (0.10.0)
       ffi (~> 1.0)
+    react-rails (2.6.0)
+      babel-transpiler (>= 0.7.0)
+      connection_pool
+      execjs
+      railties (>= 3.2)
+      tilt
     regexp_parser (1.6.0)
     responders (3.0.0)
       actionpack (>= 5.0)
@@ -302,6 +313,7 @@ DEPENDENCIES
   pg (>= 0.18, < 2.0)
   puma (~> 3.11)
   rails (~> 6.0.0)
+  react-rails
   rspec-rails
   sass-rails (~> 5)
   selenium-webdriver