Automatically appending to the jumplist after more motions

[rcorre]

There's a number of situations where I've performed a motion and wanted to jump back to the previous cursor/selection, but noticed helix does not automatically create a jumplist entry, such as:

• n/N
• g. (though other g motions like gd do)
• Any "unimpaired" [] motion
• Any m motion

I could remap every single one of these to prepend "save_selection", but that feels unweildy for the "unimpaired" motions, and I'm not sure it's possible at all for m, at least for matching arbitrary pairs. I did see #2930 specifically regarding search, but is there a better way to approach this in general?