feat: edit history

[ibnuh]

as discussed on #798 please help to review, I might be missing a lot of stuff since this is my first shot on golang and react

[Zeng1998]

And do we need to provide a convenient way to fall back? to make better use of memo history.

[ibnuh]

fall back as in, restore specific memo history to be current?

[Zeng1998]

fall back as in, restore specific memo history to be current?

Yes, that's what I mean.

[Zeng1998]

And do we need to provide a convenient way to fall back? to make better use of memo history.

This may be another enhancement and we can discuss in another PR if we exactly have this need.

[boojack]

I think we can save the edit histories into the activity table. FYI @ibnuh https://github.com/usememos/memos/blob/main/api/activity.go#L29