feat: migrate LSP to opt-in native language servers

src/ruby_host.rb

@@ -81,8 +81,11 @@ module Vamp
   Mode.private_class_method :new
 
   class Config
+    attr_reader :lsp
+
     def initialize
       @plugins = []
+      @lsp = {}
       @bindings = []
       @leader = "space"
       @file_explorer_side = "right"
@@ -159,8 +162,23 @@ module Vamp
     end
 
     def response
+      lsp = @lsp.to_h do |language, value|
+        language = Vamp.string!(language, "LSP language key")
+        if language.empty? || language.match?(/[[:cntrl:]]/)
+          raise ArgumentError, "LSP language keys must not be empty or contain control characters"
+        end
+        value = case value
+                when TrueClass, FalseClass
+                  value
+                when Hash
+                  Vamp.json_value!(value)
+                else
+                  raise TypeError, "LSP language #{language.inspect} must be true, false, or a Hash"
+                end
+        [language, value]
+      end
       { "version" => 1, "type" => "config", "plugins" => @plugins,
-        "bindings" => @bindings, "leader" => @leader,
+        "lsp" => lsp, "bindings" => @bindings, "leader" => @leader,
         "file_explorer_side" => @file_explorer_side,
         "file_picker_view" => @file_picker_view,
         "file_explorer_view" => @file_explorer_view,