feature: add pouch logs cli command

[HusterWan]

Signed-off-by: Michael Wan zirenwan@gmail.com

Ⅰ. Describe what this PR did

add logs cli command for pouch

Ⅱ. Does this pull request fix one issue?

fixes #865

Ⅲ. Describe how you did it

Ⅳ. Describe how to verify it

Ⅴ. Special notes for reviews

[codecov-io]

Codecov Report

Merging #886 into master will decrease coverage by 0.13%.
The diff coverage is 0%.

@@            Coverage Diff             @@
##           master     #886      +/-   ##
==========================================
- Coverage   14.51%   14.37%   -0.14%     
==========================================
  Files         116      117       +1     
  Lines        7034     7101      +67     
==========================================
  Hits         1021     1021              
- Misses       5926     5993      +67     
  Partials       87       87

Impacted Files	Coverage Δ
client/container.go	0% <0%> (ø)	⬆️
cli/main.go	0% <0%> (ø)	⬆️
cli/logs.go	0% <0%> (ø)

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[Letty5411]

@HusterWan you may also need to add the subcmd in cli/main.go

[Letty5411]

LGTM