LogAnalysis should not rely on cell execution being recorded by LogEvents

[jlewi]

Now that we no longer need to process RunMe logs we can simplify log processing

• For the watermark we can just keep track of a single file and its offset
• Only the latest file will be active. Therefore we don't need to watch the filesystem for modifications
  we can just periodically scan the logs.

Changes to BlockLog Proto

• We can remove ExecTraceIds
  • Since the AI doesn't handle executions we don't have traces for execution
  • We should rely on the Frontend sending details of execution (e.g. execute code) which it currently isn't
  • Since LogEvents are processed in order we know that the most recent cell execution will be the final one reported by a LogEvent
• Add a field to record suggestion status
  • Right now we only get log events for cells being accepted we don't record cells being rejected but we can reasonably infer that unaccepted cells have been rejected

Config Changes

• We can deprecate the logDirs field in learner since users should no longer need to configure it to monitor RunMe Logs
• Simplifying the setup process of the learner is one of the main motivations of this PR.

Analyzer Changes

*. We no longer need CombineTraces functions for RunMe and Execute traces

• We just accumulate LogEvents on the BlockLog object as we sequentially process the logs.

Other changes

• Add an RPC method to check the logs status.
  • This will report the watermark
• Add ZapProto function to handle logging protos that include RunMe objects
  • We can't rely on the custom go plugin to generate the MarshalObject function because the RunMe protos aren't using that plugin

Related to #211

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