[feature request] implement a RPC way like fzf's `--listen`

[phanen]

fzf (0.36.0+) have a --listen flag enabling user to write a client in other language to interact with it by HTTP API:
https://github.com/junegunn/fzf/blob/10cbac20f96de35acf272ddc4a998868c5694bd9/CHANGELOG.md?plain=1#L1139

It would be better if skim implement a similar interface.