store: add Store method wrappers for hydra#58
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…vation_from_path store: fix aarch64 build — use c_char instead of i8 for FFI pointer cast
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Summary
This PR wraps several Nix C API store functions for future use in hydra's queue-runner.
is_valid_path: checks if a store path existscopy_path/copy_closure: copy a single path or a full closure between storesquery_path_from_hash_part: look up a store path by its hash prefixget_version: get the store protocol version stringderivation_from_path: parse a .drv file into its components