Pass machine ID to server for telemetry (#3157)

### Motivation

Pass the unique machine identifier to the server as an initialization option, so that it can be used to estimate number of unique users on server telemetry events.

Reminder that we [do not collect any telemetry by default](https://github.com/Shopify/ruby-lsp/tree/main/vscode#telemetry), unless a VS Code extension implements the `getTelemetrySenderObject` command.

### Implementation

Started passing the value from the extension and saving it in the global state.

### Automated Tests

Added a test.

lib/ruby_lsp/global_state.rb

@@ -32,6 +32,9 @@ class GlobalState
     sig { returns(URI::Generic) }
     attr_reader :workspace_uri
 
+    sig { returns(T.nilable(String)) }
+    attr_reader :telemetry_machine_id
+
     sig { void }
     def initialize
       @workspace_uri = T.let(URI::Generic.from_path(path: Dir.pwd), URI::Generic)
@@ -57,6 +60,7 @@ def initialize
       @client_capabilities = T.let(ClientCapabilities.new, ClientCapabilities)
       @enabled_feature_flags = T.let({}, T::Hash[Symbol, T::Boolean])
       @mutex = T.let(Mutex.new, Mutex)
+      @telemetry_machine_id = T.let(nil, T.nilable(String))
     end
 
     sig { type_parameters(:T).params(block: T.proc.returns(T.type_parameter(:T))).returns(T.type_parameter(:T)) }
@@ -175,6 +179,7 @@ def apply_options(options)
       enabled_flags = options.dig(:initializationOptions, :enabledFeatureFlags)
       @enabled_feature_flags = enabled_flags if enabled_flags
 
+      @telemetry_machine_id = options.dig(:initializationOptions, :telemetryMachineId)
       notifications
     end
 

test/global_state_test.rb

@@ -302,6 +302,14 @@ def test_falls_back_to_internal_integration_for_formatters_if_rubocop_has_no_add
       assert_equal("rubocop_internal", state.formatter)
     end
 
+    def test_saves_telemetry_machine_id
+      state = GlobalState.new
+      assert_nil(state.telemetry_machine_id)
+
+      state.apply_options({ initializationOptions: { telemetryMachineId: "test_machine_id" } })
+      assert_equal("test_machine_id", state.telemetry_machine_id)
+    end
+
     private
 
     def stub_direct_dependencies(dependencies)

vscode/src/client.ts

@@ -244,6 +244,7 @@ function collectClientOptions(
       indexing: configuration.get("indexing"),
       addonSettings: configuration.get("addonSettings"),
       enabledFeatureFlags: enabledFeatureFlags(),
+      telemetryMachineId: vscode.env.machineId,
     },
   };
 }