Hashable "Big Integer" (for sparse simulation)

Given the recent success in "spoofing" quantum volume, with a combination of automatic circuit elision (ACE) and sparse simulation, it made sense to try to reduce the significant computational overhead of sparse simulation. (Anthropic) Claude proposed a meaningful improvement on the sparse truncation method, for when memory limit is exceeded, but we had another productive back-and-forth about std::map vs. std::unordered_map, and the readily-hashable big_integer.hpp in Qrack. So, the credit for the truncation rewrite and hashing is largely due to Claude, with thanks.

Full Changelog:
unitaryfoundation/qrack@vm6502q.v10.4.1...vm6502q.v10.5.0
v1.87.1...v1.87.2

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