Add PEP 561 type stubs for chialisp

[emlowe]

Summary

• Adopts the same pattern as chiavdf/chiabip158: a private _chialisp Rust extension re-exported from a pure-Python chialisp package with py.typed and __init__.pyi.
• Replaces the legacy python/clvm_tools_rs/ shim with a proper python/chialisp/ mixed layout (module-name = "chialisp._chialisp").
• Adds a typing CI job that builds the package with maturin and runs stubtest --concise chialisp.

This lets chia-blockchain remove [mypy-chialisp.*] ignore_missing_imports = True once a release is published.

Approach

Piece	Role
chialisp/_chialisp.abi3.so	Private PyO3 extension (renamed from chialisp)
chialisp/__init__.py	Explicit public re-exports + sys.modules registration for binutils
chialisp/__init__.pyi	Typed public API (compile_clvm, start_clvm_program, etc.)
chialisp/binutils.pyi	Stubs for the binutils submodule
chialisp/py.typed	PEP 561 marker

Public imports are unchanged: from chialisp import compile_clvm.

Test plan

• maturin build --release produces wheel with _chialisp.abi3.so, stubs, and py.typed
• stubtest --concise chialisp passes locally
• CI typing job passes
• Existing wheel/integration tests still pass

Made with Cursor

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Note

Low Risk
Packaging and typing surface changes only; public from chialisp import … API is preserved via re-exports, with risk mainly around wheel layout and the removed clvm_tools_rs shim path.

Overview
Adds PEP 561 typing for the chialisp package using a mixed Rust/Python layout: maturin now builds a private extension chialisp._chialisp (PyO3 module renamed in api.rs), while python/chialisp/ holds the public __init__.py re-exports, py.typed, and __init__.pyi / binutils.pyi stubs. pyproject.toml sets python-source and module-name accordingly; .gitignore ignores local *.abi3.so builds.

Removes the old python/clvm_tools_rs/ star-import shim and its cmds.py helper (compatibility for tests still goes through ./tmp in CI, unchanged in this diff).

Adds a typing CI job that builds the wheel with maturin and runs stubtest --concise chialisp so the published API matches the stubs.

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[prozacchiwawa]

Neat.