Start copilot and check sign in status

crates/copilot/src/request.rs

@@ -0,0 +1,22 @@
+use serde::{Deserialize, Serialize};
+
+pub enum CheckStatus {}
+
+#[derive(Debug, Serialize, Deserialize)]
+#[serde(rename_all = "camelCase")]
+pub struct CheckStatusParams {
+    pub local_checks_only: bool,
+}
+
+#[derive(Debug, Serialize, Deserialize)]
+#[serde(rename_all = "camelCase")]
+pub struct CheckStatusResult {
+    pub status: String,
+    pub user: Option<String>,
+}
+
+impl lsp::request::Request for CheckStatus {
+    type Params = CheckStatusParams;
+    type Result = CheckStatusResult;
+    const METHOD: &'static str = "checkStatus";
+}