use common static values for Vector2/Vector3/CFrame

[BaileyTab]

in a recent release note

this pull request basically just replaces any instances where those static methods can be used over constructing a new datatype

here's a benchmark of the performance gains of using Vector3.zero instead of Vector3.new(...) benchmarked on an Apple M1

[Quenty]

Looks great. We'll need to update luacheck to make this happen. And probably update selene too. And then we'll also want to update main.