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

ale_linters/ruby/sorbet.vim

@@ -1,6 +1,7 @@
 call ale#Set('ruby_sorbet_executable', 'srb')
 call ale#Set('ruby_sorbet_options', '')
 call ale#Set('ruby_sorbet_enable_watchman', 0)
+call ale#Set('ruby_sorbet_initialization_options', { 'highlightUntyped': v:false })
 
 function! ale_linters#ruby#sorbet#GetCommand(buffer) abort
     let l:executable = ale#Var(a:buffer, 'ruby_sorbet_executable')
@@ -21,6 +22,6 @@ call ale#linter#Define('ruby', {
 \   'language': 'ruby',
 \   'executable': {b -> ale#Var(b, 'ruby_sorbet_executable')},
 \   'command': function('ale_linters#ruby#sorbet#GetCommand'),
-\   'project_root': function('ale#ruby#FindProjectRoot')
+\   'project_root': function('ale#ruby#FindProjectRoot'),
+\   'initialization_options': {b -> ale#Var(b, 'ruby_sorbet_initialization_options')}
 \})
-