* fix: check dbus response for nullptr before using
* chore: use BindOnce for ProxyObject::CallMethod cb
* chore: comment out name of unused argument
* fix: re-enable and fix linux power monitor tests
* fix: change tyop from code comments
* refactor: don't keep unnecessary dbus pointer
* chore: remove the 'TODO: fix this' spec comment
* feat(BrowserWindow): expose interface to query system idle state
* test(BrowserWindow): update test cases for querySystemIdle interface
* docs(BrowserWindow): add querySystemIdle interface documentation
* refactor(powerMonitor): move querySystemIdle into powerMonitor
* test(powerMonitor): split test cases for all platform