MultiStepAgent logs in JSON serializable format.

[benediktstroebl]

Added method to MultiStepAgent class that returns logs in a JSON serializable format. It also parses tool call arguments and action outputs.

This method is handy for storing logs in a pretty format that is easy to read and use further.

[aymeric-roucher]

@benediktstroebl indeed, this json serializable format can be helpful when logging stuff! Could you keep only the json serialization format in this PR? (since parsing json tool calls is already done in other PRs like #163)

[benediktstroebl]

@aymeric-roucher Sounds good! I removed the other edits from the PR. This one now only contains the edits related to the new json serialization method to_json().

[clefourrier]

Hi @benediktstroebl ! I'm currently redoing the logging, and reused a lot of your code in #316 - would you be OK with being a co-author of my PR?
(I changed the logic where it happens)

[benediktstroebl]

Hi @benediktstroebl ! I'm currently redoing the logging, and reused a lot of your code in #316 - would you be OK with being a co-author of my PR? (I changed the logic where it happens)

Hi @clefourrier, that sounds good! Let's co-author it. Can you add me to your PR so we can close this one?

[clefourrier]

Yep! I think I need your email for this

[clefourrier]

Or you can add a code suggestion somewhere using ```suggestion
(like in a docstring) and I can commit it which should make you a coauthor

[benediktstroebl]

@clefourrier Done. I added a docstring to the function in utils.py you used from my code IIC. Thanks!

[clefourrier]

Hm, I'm not finding it in my PR?

[benediktstroebl]

Can you see it now?

[clefourrier]

Yep, merged!