[Gap Decorations]: Setup paint for simple gap cases

This CL uses the gap geometry from crrev.com/c/6092603 to paint gap
decorations within grid. The change begins by introducing a
`ShouldPaintGapDecorations` method in the `BoxDecorationData` class.
This method affects the `ShouldPaint` method, ensuring that gap
decorations are painted when necessary.

Next, two methods, `PaintColumnGaps` and `PaintRowGaps`, are
implemented in the `BoxFragmentPainter` class. These methods use the
stored offsets to construct rects, which are passed to appropriate
paint ops.

Future changes will preliminarily handle row fragmentation and
update the painting logic to use gap intersection pairs, as outlined in
the spec: https://drafts.csswg.org/css-gaps-1/#break.

Bug: 357648037
Change-Id: I87911c3da7a61562ce5126e396684902de5a1b73
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/6101656
Reviewed-by: Kurt Catti-Schmidt <kschmi@microsoft.com>
Reviewed-by: Kevin Babbitt <kbabbitt@microsoft.com>
Reviewed-by: Alison Maher <almaher@microsoft.com>
Commit-Queue: Sam Davis Omekara <samomekarajr@microsoft.com>
Cr-Commit-Position: refs/heads/main@{#1413342}