Kaival Parikh a4401c13d8 Allow using custom index readers and writers (#4180)
Summary:
### Description

- Create custom readers and writers for index IO, which take function pointers as input
- Also expose these from the C_API

This is helpful for FFI use, where calling processes would pass upcall stubs for streamlined IO

Pull Request resolved: https://github.com/facebookresearch/faiss/pull/4180

Reviewed By: gtwang01

Differential Revision: D71208266

Pulled By: mnorris11

fbshipit-source-id: ab82397d4780a2a07c7bfdc52329968377f42af4
2025-04-01 11:05:29 -07:00
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