inferior: Create the store proxy listening socket only once.

Previously, each 'inferior-eval-with-store' call would have the calling
process create a temporary directory with a listening socket in there.
Now that listening socket is created once and reused in subsequent
calls.

* guix/inferior.scm (<inferior>)[bridge-file-name, bridge-socket]: New
fields.
(port->inferior): Adjust accordingly.
(close-inferior): Close 'inferior-bridge-socket' and delete
'inferior-bridge-file-name' if set.
(open-store-bridge!, ensure-store-bridge!): New procedures.
(inferior-eval-with-store): Use them.

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