scripts/logging: Create live_log_parser

Create a new, generic parser, that is able to parse dictionary logs live
- showing the messages as they are received from the device.

This functionality previously existed only for reading the log from a UART.
With the new script, the functionality is extended to be able to also read
the log from a file or stdin.
Additionally, the script is written in an extend-able way, making it simple
to support more input sources in the future.

The new script contains a better version of the live functionality than the
old script of log_parser_uart script, therefore, the old script has been
deprecated.
The UART script is still available, and will work by invoking the new
implementation with relevant arguments translation, however, it should
ideally not be used any longer, and should be removed from a future
release.

Signed-off-by: Omri Sarig <omsi@demant.com>