Allow editors to selectively share backend processes #164
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So far, either all editors used the same backend process (which only works if they are the same kind of editor), or they all used their own process (which is inefficient and spawns many processes). This PR allows editors to specify a
share_id
that allows editors to selectively share backend processes. For example, all Python editors could share a Python-specific backend, but still co-exist with other kinds of editors.