session/resume support

[shushakov-u]

Hi! Quick roadmap question.

Do you plan to support the ACP session/resume method? It would be more useful for clients that cache session history, so they don’t need to replay it via session/load every time.

[mrjones2014]

I was just scratching my head wondering why this wasn't working 😅 session resume would be huge!

[mrjones2014]

I submitted PR #317 for this