Implement Serial Console app & more (#239)

- Implemented new app: Serial Console
- `Uart::writeString()`: fixed 2 mutex bugs
- `AlertDialog::start()` with default "OK" button added
- Created `tt::lvgl::defaultLockTime` for re-use
- Removed various usages of deprecated `lvgl::obj_set_style_no_padding()`
- Implemented `hal::uart::getNames()` to list all interface names

TactilityHeadless/Include/Tactility/hal/uart/Uart.h

@@ -121,4 +121,6 @@ public:
  */
 std::unique_ptr<Uart> open(std::string name);
 
+std::vector<std::string> getNames();
+
 } // namespace tt::hal::uart