Added playback mode ready for offline processing

CoreConfig how has a playback mode option which can be set to reprocess
or read.

Setting it to reprocess means that all derived signals are reprocessed
during playback, in this case the PlaybackEngine only plays back the
signals whose source is set to "origin"

Setting it to read means that all derived signals are playedback from
the recorded buffer, this whill be the preferred mode once offline
processing is set up which will allow for more complex data processing
offline once a recording is completed, which would require the read
playback mode as it wouldn't support realtime processing as reprocess
does

pyproject.toml

@@ -8,6 +8,8 @@ authors = [
 ]
 requires-python = ">=3.13"
 dependencies = [
+    "psutil>=7.2.2",
+    "psutils>=3.3.17",
     "pydantic>=2.13.4",
 ]