feat: Add config-ssh command

[kylecarbs]

Closes #254, #499, and #737.

[codecov]

Codecov Report

Merging #735 (6b0c76d) into main (1bab7e8) will decrease coverage by 0.58%.
The diff coverage is 57.76%.

@@            Coverage Diff             @@
##             main     #735      +/-   ##
==========================================
- Coverage   64.53%   63.95%   -0.59%     
==========================================
  Files         198      199       +1     
  Lines       11622    11826     +204     
  Branches       85       87       +2     
==========================================
+ Hits         7500     7563      +63     
- Misses       3333     3437     +104     
- Partials      789      826      +37     

Flag	Coverage Δ
unittest-go-	63.03% <54.51%> (-0.58%)	⬇️
unittest-go-macos-latest	58.85% <54.34%> (-0.65%)	⬇️
unittest-go-ubuntu-latest	61.79% <54.51%> (-0.41%)	⬇️
unittest-go-windows-2022	58.03% <53.62%> (-0.32%)	⬇️
unittest-js	62.63% <ø> (-0.70%)	⬇️

Impacted Files	Coverage Δ
agent/conn.go	65.38% <ø> (-3.59%)	⬇️
cli/workspacedelete.go	17.64% <0.00%> (ø)
cli/workspacestart.go	15.15% <0.00%> (ø)
cli/workspacestop.go	13.88% <0.00%> (ø)
provisioner/terraform/provision.go	68.82% <0.00%> (ø)
coderd/workspaceresources.go	56.09% <26.92%> (-5.45%)	⬇️
cli/ssh.go	38.88% <35.00%> (-4.45%)	⬇️
cli/start.go	65.74% <50.00%> (-0.42%)	⬇️
cli/configssh.go	58.03% <55.23%> (+0.89%)	⬆️
cli/cliui/agent.go	82.45% <70.00%> (+0.31%)	⬆️
... and 29 more

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