[Feature suggestion] "leastconn" strategy

[phantomcraft]

In haproxy there is a strategy called "leastconn".

==> https://www.digitalocean.com/community/tutorials/an-introduction-to-haproxy-and-load-balancing-concepts

leastconn
Selects the server with the least number of connections–it is recommended for longer sessions. Servers in the same backend are also rotated in a round-robin fashion.

It would be useful if implemented in Glider, now that is possible to balance TCP/UDP connections with support for Unix Sockets.

[github-actions]

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