chore: Move console to separate package

[irvinlim]

The github.com/hinshun/vt10x package does not support Windows:

../../../../pkg/mod/github.com/hinshun/vt10x@v0.0.0-20220119200601-820417d04eec/vt_other.go:26:8: t.cur.attr undefined (type Cursor has no field or method attr, but does have Attr)
../../../../pkg/mod/github.com/hinshun/vt10x@v0.0.0-20220119200601-820417d04eec/vt_other.go:27:8: t.cur.attr undefined (type Cursor has no field or method attr, but does have Attr)

Since we only use it for unit tests, we should chuck it into its own package so that it does not need to be imported when building the CLI.

[codecov[bot]]

Codecov Report

Merging #69 (f50393a) into main (1b52a38) will not change coverage. The diff coverage is 100.00%.

@@           Coverage Diff           @@
##             main      #69   +/-   ##
=======================================
  Coverage   62.61%   62.61%           
=======================================
  Files         196      196           
  Lines        9825     9825           
=======================================
  Hits         6152     6152           
  Misses       3363     3363           
  Partials      310      310           

Impacted Files	Coverage Δ
pkg/cli/console/console.go	81.25% <ø> (ø)
pkg/cli/streams/streams.go	50.00% <100.00%> (ø)
pkg/runtime/testing/command.go	75.34% <100.00%> (ø)

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