Add keybinds for common actions to client WorldEdit

**Is your feature request related to a problem? Please describe.**
Adding keybinds for common actions, such as `//pos1` and `//pos2` to be used by client-side WorldEdit, such as Forge/Fabric in Singleplayer.

**Describe the solution you'd like**
Just some simple keybinds for pos1 and pos2, unsure if more make sense to add too such as `//desel`.

**Describe alternatives you've considered**
This could be done with a macro-type mod by binding commands to keybinds.

**Additional context**
This could theoretically be expanded to send data via a message channel (or sending commands) when both the client and server mods are installed.