feat: add native LSP hover action and popup

src/ruby_host.rb

@@ -64,7 +64,7 @@ module Vamp
       copy_system paste_system_before paste_system_after
       select_lines clone_above clone_below select_next skip_occurrence select_all
       file_picker file_explorer
-      lsp_definition lsp_diagnostics
+      lsp_definition lsp_diagnostics lsp_hover
     ].each do |name|
       action = Action.new("core.#{name}".freeze).freeze
       define_singleton_method(name) { action }