KCL: Convert x/y lines to use keyword arguments (#5615)

Previously, `xLine`, `xLineTo`, `yLine` and `yLineTo` used positional arguments. Now:

- `xLineTo` and `yLineTo` have been removed
- `xLine` and `yLine` both use keyword arguments:
  - `length`, optional (i.e. a relative distance along the X or Y axis)
  - `endAbsolute` optional (i.e. an absolute point along the X or Y axis)
  - `tag` optional
- Exactly one of `length` or `endAbsolute` must be given. Not both, not neither.

For example:

```
// Old way
|> xLine(6.04, %)
|> yLineTo(20, %, $base)

// New way
|> xLine(length = 6.04)
|> yLine(endAbsolute = 20, tag = $base)
```

This also improves some of the general-purpose keyword arguments code in modeling app's TS codebase.

e2e/playwright/feature-tree-pane.spec.ts

@@ -8,7 +8,7 @@ const FEATURE_TREE_EXAMPLE_CODE = `export fn timesFive(x) {
 export fn triangle() {
   return startSketchOn('XZ')
     |> startProfileAt([0, 0], %)
-    |> xLine(10, %)
+    |> xLine(length = 10)
     |> line(end = [-10, -5])
     |> line(endAbsolute = [profileStartX(%), profileStartY(%)])
     |> close()
@@ -28,7 +28,7 @@ plane001 = offsetPlane('XY', offset = 10)
 sketch002 = startSketchOn(plane001)
   |> startProfileAt([-20, 0], %)
   |> line(end = [5, -15])
-  |> xLine(-10, %)
+  |> xLine(length = -10)
   |> line(endAbsolute = [-40, 0])
   |> line(endAbsolute = [profileStartX(%), profileStartY(%)])
   |> close()
@@ -402,7 +402,7 @@ test.describe('Feature Tree pane', () => {
 sketch001 = startSketchOn(plane001)
 profile001 = circle(sketch001, center = [0, 20], radius = 12)
 profile002 = startProfileAt([0, 7.25], sketch001)
-  |> xLine(13.3, %)
+  |> xLine(length = 13.3)
 profile003 = startProfileAt([0, -4.93], sketch001)
   |> line(endAbsolute = [-5.56, 0])`
     await context.folderSetupFn(async (dir) => {