Dump the history actions from a grist file

[fflorent]

Describe the problem to be solved

The history actions are stored marshalled in the grist file, we cannot easily consult their content.

Describe the solution you would like

Implementing a yarn cli history dump command would be useful:

yarn -s cli history dump --help
Usage: grist-toolbox history dump [options] <docPath>

Dump the lattest history actions

Options:
  -m, --max-actions  number of actions to dump
  -o, --output       The output file
  -h, --help         display help for command