[shape][safe] Add boundary checks for values of `NDArrayShape` + better docstrings#205

MadAlex1997 merged 5 commits intoMojo-Numerics-and-Algorithms-group:pre-0.6Mojo-Numerics-and-Algorithms-group/NuMojo:pre-0.6from

forfudan:errorforfudan/NuMojo:errorCopy head branch name to clipboard