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The `Expr` build already includes a lot of useful filtering options, `eq, ne, gt/gte, lt/lte, and_, or_, contains, cast`, but is was missing a membership like `isin`. This PR adds that support, as minimally as possible, allowing easy filtering for membership in a list, without needing to be a series of `where` expressions. I didn't see anything in CONTRIBUTING.md about needing a feature request or issue first, so I just made the change. My apologies if I missed that somewhere. Thanks for the vector store, we're using it now in paperless-ngx.