Add SpriteList.draw_range for partial batch rendering

[snowyukitty]

Fixes #2231.

Add SpriteList.draw_range(start=0, stop=None, ...) so games can draw a contiguous portion of an existing sprite batch without creating another list. Bounds follow Python slicing, including negative indices, clipping and an exclusive stop; selected sprites retain list order.

Declare and document draw_range on the read-only SpriteSequence, following draw. SpriteList provides the rendering implementation, and consumers annotated as SpriteSequence can call it directly.

The buffer renderer uses the existing index-buffer offset. The texture renderer uses a shader instance offset and restores the shared uniform after rendering. Empty, invisible and transparent ranges keep lazy lists uninitialized. Filtering and blending options match draw(). Legacy texture shaders remain usable for ordinary drawing and zero-start ranges; a nonzero range requires sprite_start.

Validation on Linux / Python 3.12 / pyglet 3.0.dev11 with Mesa and Xvfb:

• python -m pytest tests/unit -q: 1,665 passed, including actual pixel and Window/View regressions in both storage implementations.
• A consumer typed as SpriteSequence[Sprite] type-checks; the same consumer fails with a missing-attribute error against the previous published interface.
• Repository make.py format --check, ruff-check, mypy and pyright pass.
• python make.py docs-full passes with warnings treated as errors, using prefetched intersphinx inventories.

Texture storage was exercised on native OpenGL. Browser/WebGL and controller hardware were not run locally.

[sjrd]

This method could be introduced in SpriteSequence, and documented there, like draw.

[snowyukitty]

Updated in 6498500.

draw_range is now declared and documented on SpriteSequence, following draw; SpriteList provides the implementation. The renderer regression calls it through a SpriteSequence[Sprite] reference, and an explicitly typed consumer passes type checking.

The 1,665 native unit tests, repository formatting/lint/type checks, and full documentation build with warnings treated as errors pass locally.