Added DeviceConfig properties to fine tune ContentCapture:

- DEVICE_CONFIG_PROPERTY_MAX_BUFFER_SIZE
- DEVICE_CONFIG_PROPERTY_IDLE_FLUSH_FREQUENCY
- DEVICE_CONFIG_PROPERTY_TEXT_CHANGE_FLUSH_FREQUENCY
- DEVICE_CONFIG_PROPERTY_LOG_HISTORY_SIZE
- DEVICE_CONFIG_PROPERTY_LOGGING_LEVEL

Test: manual verification
Test: atest CtsContentCaptureServiceTestCases

Bug: 123096662
Fixes: 121044064
Fixes: 121044306

Change-Id: I08623516bb7ebbe9c900987be853f4f395250016