Add initialization_options to Sorbet LSP linter (#4954)

* Add initialization_options to Sorbet LSP linter

Using a predefined object will ensure that Sorbet always receives an
object instead of an array. LSP defines the initializationOptions as
anything. Unfortunately Sorbet is too strict and raises an error when
anything other than an object is passed which causes the linter to fail

* Document empty objects will prevent Sorbet from properly initializing

doc/ale-ruby.txt

@@ -267,6 +267,23 @@ g:ale_ruby_sorbet_enable_watchman
   to files from outside of vim. Defaults to disable watchman because it
   requires watchman to be installed separately from sorbet.
 
+                               *ale-options.ruby_sorbet_initialization_options*
+                                     *g:ale_ruby_sorbet_initialization_options*
+                                     *b:ale_ruby_sorbet_initialization_options*
+ruby_sorbet_initialization_options
+g:ale_ruby_sorbet_initialization_options
+  Type: |Dictionary|
+  Default: `{ 'highlightUntyped': v:false }`
+
+  This variable can be changed to modify initialization options provided to
+  the Sorbet language server. By default, a minimal object with defaults is
+  provided to ensure proper LSP initialization.
+
+  Setting this variable to a an empty object will cause sorbet LSP to
+  fail during initialization.
+
+  See https://sorbet.org/docs/lsp#initialize-request for available options.
+
 
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 standardrb                                                *ale-ruby-standardrb*