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multiprocess: Add capnp wrapper for Chain interface

Placeholder Ryan Ofsky requested to merge github/fork/ryanofsky/pr/ipc-chain into master

Changes making it possible to call interface::Chain over a socket.

Note: The changes in this PR allow a bitcoin-node process to be controlled over a socket. The socket can either be an UNIX socket created by specifying the -ipcbind option, or it can be a socketpair created by a controlling process and passed to bitcoin-node via the -ipcfd=<n> with a file descriptor number. This PR is a dependency of #10102 which allows the wallet code to run in a separate process and use the Chain interface.

This PR is part of the process separation project.

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