Install Flutter-related packages

customizations.el

@@ -85,6 +85,7 @@
      enlive
      eshell-fringe-status
      eshell-prompt-extras
+     esxml
      expand-region
      fancy-narrow
      feature-mode
@@ -121,6 +122,7 @@
      helm-chrome
      helm-mu
      hl-todo
+     hover
      hungarian-holidays
      hungry-delete
      hyde
@@ -137,6 +139,9 @@
      kubernetes
      loccur
      lorem-ipsum
+     lsp-dart
+     lsp-mode
+     lsp-ui
      magit
      magit-gerrit
      magithub