upgrade faiss to 1.14.1

[alexanderguzhva]

• Upgrade faiss to 1.14.1+, commit so far is e5114c2368073d00316a866baa33e6595df3c396 (Mar 20 2026)
• deprecate enable_bf16_patch logic
• get rid of the forked IndexPQ, ProductQuantizer
• get rid of forked IVFFastScan-related facilities (such as pq4)
• get rid of the forked simblib
• get rid of the forked IndexBinaryHNSW
• get rid of the forked partitioning_avx2
• in process of merging dynamic dispatching mechanisms
• modernize a forked IVFFastScan indices to match the baseline
• upgrade the libfaiss.cmake file

Contains #1496
Contains facebookresearch/faiss#4894
Contains facebookresearch/faiss#4926 , which also fixes some problems with the pqfastscan filtering code

[mergify]

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[alexanderguzhva]

/kind improvement
issue: #1501

[alexanderguzhva]

rebased on top of master

[foxspy]

/lgtm

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