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Add infrastructure to dynamically load postgres extensions and shared libraries from remote extension storage. Before postgres start downloads list of available remote extensions and libraries, and also downloads 'shared_preload_libraries'. After postgres is running, 'compute_ctl' listens for HTTP requests to load files. Postgres has new GUC 'extension_server_port' to specify port on which 'compute_ctl' listens for requests. When PostgreSQL requests a file, 'compute_ctl' downloads it. See more details about feature design and remote extension storage layout in docs/rfcs/024-extension-loading.md --------- Co-authored-by: Anastasia Lubennikova <anastasia@neon.tech> Co-authored-by: Alek Westover <alek.westover@gmail.com>