feat: now can highlight relevant parts of logs

Needs !214 (merged)

To highlight all the logging messages containing the given key do this:

• rust: tlog::highlight_key(log_key, Some(color)).
• lua: picolib.log.highlight_key(log_key, color).

To disable highlight for the given key do this:

• rust: tlog::highlight_key(log_key, None).
• lua: picolib.log.highlight_key(log_key).

To disable highlighting of all keys do this:

• rust: tlog::clear_highlight().
• lua: picolib.log.clear_highlight().