Add LogMessageViewer

[kmmoore]

Adds an extension that displays any foxglove.Log messages received during the entire displayed timeline. Allows filtering based on severity and contents. Clicking a message jumps the playhead to that timestamp

[defunctzombie]

@kmmoore Since we already have a log viewer built-in, what's the main thing you found lacking with it? The ability to view logs across the entire timeline and click-to-seek?

While testing this did you run into memory issues or performance? One concern we have with tackling this with built-in is the implication it has to memory use if someone has lots of logs.

[kmmoore]

Hi thanks for taking a look! The main features I wanted were:

• The ability to see all log messages that occurred in the displayed time range (the built in extension seems to only display them once you play past the point where the message is received).
• The ability to click on a message and jump the playhead to that location in the timeline.
• The ability to fuzzy-filter log messages (a la fzf, or sublime text).

I didn't run in to any performance/memory issues in the logs I tested (although I didn't test any truly massive logs). The extension does have a configurable limit on the maximum number of messages it will load to hopefully prevent pathological cases.