KCL: Angled line should use keyword args (#5803)

We continue migrating KCL stdlib functions to use keyword arguments. Next up is the `angledLine` family of functions (except `angledLineThatIntersects, which will be a quick follow-up).

Before vs. after:

`angledLine({angle = 90, length = 3}, %, $edge)`
  => `angledLine(angle = 90, length = 3, tag = $edge)`

`angledLineOfXLength({angle = 90, length = 3}, %, $edge)`
  => `angledLine(angle = 90, lengthX = 3, tag = $edge)`

`angledLineOfYLength({angle = 90, length = 3}, %, $edge)`
  => `angledLine(angle = 90, lengthY = 3, tag = $edge)`

`angledLineToX({angle = 90, length = 3}, %, $edge)`
  => `angledLine(angle = 90, endAbsoluteX = 3, tag = $edge)`

`angledLineToY({angle = 90, length = 3}, %, $edge)`
  => `angledLine(angle = 90, endAbsoluteY = 3, tag = $edge)`

src/unitTestUtils.ts

@@ -0,0 +1,32 @@
+import {
+  ARG_ANGLE,
+  ARG_END_ABSOLUTE_X,
+  ARG_END_ABSOLUTE_Y,
+  ARG_LENGTH,
+  ARG_LENGTH_X,
+  ARG_LENGTH_Y,
+} from '@src/lang/constants'
+import { createArrayExpression } from '@src/lang/create'
+import { findKwArg, findKwArgAny } from '@src/lang/util'
+import type { CallExpressionKw, Expr } from '@src/lang/wasm'
+
+/**
+Find the angle and some sort of length parameter from an angledLine-ish call.
+E.g. finds the (angle, length) in angledLine or the (angle, endAbsoluteX) in angledLineToX
+*/
+export function findAngleLengthPair(call: CallExpressionKw): Expr | undefined {
+  const angle = findKwArg(ARG_ANGLE, call)
+  const lengthLike = findKwArgAny(
+    [
+      ARG_LENGTH,
+      ARG_LENGTH_X,
+      ARG_LENGTH_Y,
+      ARG_END_ABSOLUTE_X,
+      ARG_END_ABSOLUTE_Y,
+    ],
+    call
+  )
+  if (angle && lengthLike) {
+    return createArrayExpression([angle, lengthLike])
+  }
+}