feat(treesitter): add get_captures() for positions and ranges

Problem: get_captures_at_pos() only returns captures at one position. It
cannot query a whole line or range. It can also miss captures from
injected languages outside the visible area.

Solution: Add vim.treesitter.get_captures() with a required start and an
optional exclusive stop. Accept row numbers or {row, col} positions.
Without a stop, query one position or a whole line. Parse the requested
range and return capture coordinates.

Deprecate get_captures_at_pos() with a compatibility wrapper and migrate
its internal callers. Keep get_captures_at_cursor() for capture names at
a window's cursor.

AI-assisted

0 files changed, 0 insertions, 0 deletions