feat: write combined server and client logs to the console and a file

[njhale]

Capture the combined log output from both client and server side and write them to the console and a log file (at ~/Library/Logs/acorn/acorn.log on MacOS).

Log files are rotated at 1 MB.

Notes:

• This is the simpler of two approaches I'd played with, the other had more control over the log formats -- e.g. color, json output, etc -- and log rotation, but was more complex and had some issues capturing everything.
• For logging to be an effective means to debug, we're going to want to instrument more of the business logic -- e.g. the socket server -- with debug logs. Be on the look out for a PR in the near future adding this.
• Long term, we may want to look at setting up OTEL logging to a file for improved tracing
• I'm going to follow this up with an error page that prints a snippet of the logs around the digest for uncaught errors and provides a "download logs" button that downloads a zip of the logs.
• We're likely also going to want to zip up the gptscript logs/config/cache with this to get a complete picture of what's going on when a user encounters an error, but I'll hold off on that for now.