An implementation of
Tezos_base.Internal_event.SINK which writes the events as JSON files in a given directory structure.
It is registered with the URI scheme
"unix-files", one can activate it with an URI containing the top-level directory in which the JSON files will be written, e.g.
"export TEZOS_EVENTS_CONFIG=unix-files:///the/path/to/write" (the path should be inexistent or already a directory).
The directory structure is as follows:
"<section-dirname>" is either