【代码贡献】新增 Quantum Counting 标记态计数模块

[tokenjunkielabs]

Refs #13

Summary

Adds a standalone Quantum Counting implementation for estimating how many basis states are marked by a Grover oracle.

• Reuses the repository's existing Grover amplitude operator and QFT convention.
• Supports either an arbitrary phase-oracle callable or a convenient list of marked bit strings.
• Builds the phase-estimation circuit with configurable precision and shots.
• Returns both the continuous marked-state estimate and its nearest bounded integer count, plus the dominant eigenphase metadata.
• Exposes the module through pyqpanda_alg and includes a runnable two-marked-states / eight-state example.

The implementation follows the standard identity M/N = sin^2(theta), using phase estimation of the Grover iterate to recover theta and then M.

Source base: OriginQ/pyqpanda-algorithm develop@5f973efccb84bc193157d1ccebe32137e307293b.
Contributor branch: woahwhattheheck:zz-sablekite/quantum-counting-clean-20260920.
Scope is additive except for the top-level package export.