GS: Allow dumping draw/frames stats.

[TJnotJT]

Description of Changes

Adds support for dumping per-draw and per-frame stats.

Known issues:

1. If dumping doesn’t start from draw 0, the first dumped draw includes stats accumulated from draw 0 onward.
2. If draws are skipped, the next dumped draw includes all stats since the last dump.

This is mainly a debug tool, so the current behavior is suitable for comparing branches.

Rationale

Makes it easier to compare branches and identify the draw or frame where stats start to differ.

Testing Steps

1. Enable Draw/Frame Stats Dumping in Settings → GS → Debug. Files will appear as 00005_draw_stats.txt (for Save Draw Stats) or 00005_f00001_frame_stats.txt (for Save Frame Stats).
2. You can also enable the same behavior using the GS runner command-line arguments.

Example output:

Prim: 4281
Draw: 16
DrawCalls: 1136
Readbacks: 0
Swizzle: 657408
Unswizzle: 0
TextureCopies: 0
TextureUploads: 9
Barriers: 1120
RenderPasses: 4

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[TJnotJT]

Updated GSUtil arrays to reflects that SW renderer does not track barriers or render passes. Also removed the "CounterLast" string from both HW and SW arrays.

[TJnotJT]

Small fix: The barrier/render pass stats were still being dumped for SW--removed that also.

[TJnotJT]

There was a typo causing an out of bounds exception in the previous change. Fixed it and checked to make sure it's running correctly.

[lightningterror]

Stats show up as expected.