Migrate Brush APIs snippets

[pengzhi-cb]

Code snippets are for:

• https://developer.android.com/develop/ui/compose/touch-input/stylus-input/ink-api-brush-apis

List of modifications:

• Ink-api-brush-apis page: Updated StockBrushes.pressure() to real API StockBrushes.pressurePen() and parameter colorIntArgb to color in Brush.createWithComposeColor (D17/D14).
• Ink-api-brush-apis page: Updated android.graphics.Color constants Color.RED and Color.BLUE to Compose Color.Red and Color.Blue in Brush.createWithComposeColor and copyWithComposeColor (D17/D14).
• Ink-api-brush-apis page (___ink-api-custom-brushes.md shared include): Placed const val TAG inside companion object and updated loadCustomBrushes(context) to loadCustomBrushes() to match parameterless signature (D17/D14).
• Formatter Measurement (D19): Executed ./gradlew :compose:snippets:spotlessApply. Line deltas: android_compose_stylus_ink_brush_create (6 -> 6 lines), android_compose_stylus_ink_brush_modify (9 -> 9 lines), android_compose_stylus_ink_brush_custom (34 -> 33 lines).

Added assets & origin (D11):

• compose/snippets/src/main/res/drawable/draw_24px.xml, flag_24px.xml, format_paint_24px.xml: Official Material Symbols vector icons (draw, flag, format_paint).
• compose/snippets/src/main/res/raw/calligraphy, flag_banner, graffiti: Gzipped binary BrushFamily protocol buffer resources for custom brush loading sample.

Snippets not migrated:

• None (all 3 snippets on the page were migrated).

[google-cla]

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[snippet-bot]

Here is the summary of changes.

You are about to add 3 region tags.

• compose/snippets/src/main/java/com/example/compose/snippets/stylus/InkApiBrushApis.kt:31, tag android_compose_stylus_ink_brush_create
• compose/snippets/src/main/java/com/example/compose/snippets/stylus/InkApiBrushApis.kt:42, tag android_compose_stylus_ink_brush_modify
• compose/snippets/src/main/java/com/example/compose/snippets/stylus/InkApiBrushApis.kt:54, tag android_compose_stylus_ink_brush_custom

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