ssh: add support for extension negotiation (rfc 8308)#211

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drakkan wants to merge 8 commits intogolang:masterfrom drakkan:rfc8308

Commits on Mar 31, 2022

improve code comments
drakkan
committed

Commits on May 19, 2022

added a shared method to parse extInfoMsgs
drakkan
committed

Commits on Jun 15, 2022

send server-sig-algs using the same order as OpenSSH
drakkan
committed