Add missing vector methods

[ZachCurtis]

Adds the following methods:

Vector2:

• Vector2:Angle(rhs)
• Vector2:FuzzyEq(rhs)
• Vector2:Abs()
• Vector2:Ceil()
• Vector2:Floor()
• Vector2:Sign()

Vector3:

• Vector3:Abs()
• Vector3:Ceil()
• Vector3:Floor()
• Vector3:Sign()

Doesn't implement optional isSigned boolean for Vector2:Angle(rhs, isSigned) Not totally sure if Option would be a good fit here. The optional axis vector is also missing on Vector3:Angle(rhs, axis)

Closes #214

[filiptibell]

Nice, thank you for the PR! Could we expand the Vector2 and Vector3 test suites to include these new methods? They are located here:

• https://github.com/lune-org/lune/blob/main/tests/roblox/datatypes/Vector2.luau
• https://github.com/lune-org/lune/blob/main/tests/roblox/datatypes/Vector3.luau

We don't have much in terms of tests for methods there yet but I think this would be a good opportunity to start and shouldn't be too complicated to do.

[ZachCurtis]

Sure thing, I should have time to add to those tests tonight.

[ZachCurtis]

Added to the tests for the methods in this PR, as well as Vector3:FuzzyEq(rhs, epsilon).

There might be a better way to test Vector2:Angle(rhs) than this, it doesn't ever return a "rounded" radian to directly check against.

[filiptibell]

LGTM 👍