Add subscript-style type annotations for Warp types

Summary

Add support for subscript-style (bracket) type annotations on all core Warp types, enabling idiomatic Python type hints:

from typing import Literal

wp.array[float]                                  # 1D array
wp.array[float, Literal[2]]                      # 2D array
wp.array2d[float]                                # 2D array (shorthand)
wp.indexedarray[float]                           # 1D indexed array
wp.types.Vector[float, Literal[3]]               # vec3f
wp.types.Matrix[float, Literal[3], Literal[3]]   # mat33f
wp.types.Quaternion[float]                       # quatf
wp.types.Transformation[float]                   # transformf
wp.tile[float]                                   # tile (dtype-only)
wp.tile[float, Literal[8], Literal[4]]           # tile with shape

Design

dtype-first parameter order — aligns with NumPy ndarray[Dtype, Shape], C++ std::array<T, N>, Rust [T; N]
Instance-based returns — subscript results are the same objects as constructor/factory results, preserving compatibility with codegen's 68+ isinstance checks
Literal[] required for type checkers — bare integers work at runtime only
Tile shape is optional — wp.tile[dtype] for annotations, wp.tile[dtype, M, N] for forward compatibility