Reject MACD signalperiod=1 for look-ahead affected TA-Lib paths

[Whning0513]

Fixes #725.

Summary

• reject signalperiod=1 for MACD and MACDFIX at the Python wrapper level
• keep MACDEXT untouched because it does not exhibit the same look-ahead issue in the current TA-Lib implementation
• add regression coverage for talib, talib.func, talib.stream, and talib.abstract entry points

Why

• with the current upstream TA-Lib behavior, MACD(..., signalperiod=1) and MACDFIX(..., signalperiod=1) can produce values that change when a future sample is appended
• rejecting this unsupported edge case is safer than returning silently look-ahead affected results

Validation

• reproduced the issue locally against the current wheel: MACD and MACDFIX show large deltas when appending a future outlier, while MACDEXT does not
• verified the patched Python wrappers from a wheel-backed local import overlay for talib, func, stream, and abstract
• I could not run the source-tree pytest suite end-to-end because rebuilding the extension locally requires MSVC build tools on this machine

[mrjbq7]

I will look at this in a week when I return. But my first reaction is that this is an upstream issue and should be fixed in the upstream TA-Lib C library.