Add CFrame.lookAlong to the Roblox standard library (#582)

Closes: #576

Adds `CFrame.lookAlong` to the Roblox standard library.

---------

Co-authored-by: Chris Chang <51393127+chriscerie@users.noreply.github.com>

Author: Midnightific

CHANGELOG.md

@@ -2,6 +2,8 @@
 This project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
 ## [Unreleased](https://github.com/Kampfkarren/selene/compare/0.26.1...HEAD)
+### Added
+- Added `CFrame.lookAlong` to the Roblox standard library
 
 ## [0.26.1](https://github.com/Kampfkarren/selene/releases/tag/0.26.1) - 2023-11-11
 ### Fixed

selene-lib/default_std/roblox_base.yml

@@ -107,6 +107,16 @@ globals:
     must_use: true
   CFrame.identity:
     property: read-only
+  CFrame.lookAlong:
+    args:
+      - type:
+          display: Vector3
+      - type:
+          display: Vector3
+      - required: false
+        type:
+          display: Vector3
+    must_use: true
   CFrame.lookAt:
     args:
       - type: