Include double precision builds in github actions

[nickpolet]

Problem statement

Using a build of godot that is compiled with the flag precision=double.

Proposed solution

Add builds that include precision=double in the github workflows.

I'm unsure of how many new builds this would require once you've included the various operating system/platforms, but this could maybe be limited to Linux/Windows/MacOS builds, as I'm not sure iOS or android support double precision floats too well.

Alternatives

The alternative here is compiling limboai locally and using precision=double in the scons command.