chore: Perform boot readiness validation via reboot_readiness service…

… on API 31+ (appium#659)

lib/tools/system-calls.js

@@ -952,6 +952,27 @@ systemCallMethods.getVersion = _.memoize(async function getVersion () {
  * @throws {Error} If the emulator is not ready within the given timeout.
  */
 systemCallMethods.waitForEmulatorReady = async function waitForEmulatorReady (timeoutMs = 20000) {
+  if (await this.getApiLevel() >= 31) {
+    let reason;
+    try {
+      await waitForCondition(async () => {
+        try {
+          reason = await this.shell(['cmd', 'reboot_readiness', 'check-subsystems-state', '--list-blocking']);
+          return _.includes(reason, 'Subsystem state: true');
+        } catch (err) {
+          log.debug(`Waiting for emulator startup. Intermediate error: ${err.message}`);
+          return false;
+        }
+      }, {
+        waitMs: timeoutMs,
+        intervalMs: 1000,
+      });
+      return;
+    } catch (e) {
+      throw new Error(`Emulator is not ready within ${timeoutMs}ms${reason ? ('. Reason: ' + reason) : ''}`);
+    }
+  }
+
   const requiredServicesRe = REQUIRED_SERVICES.map((name) => new RegExp(`\\b${name}:`));
   let services;
   try {