feature: skeleton of upgrade interface

[HusterWan]

Signed-off-by: HusterWan [email protected]

Ⅰ. Describe what this PR did

add skeleton of pouch upgrade interface

Ⅱ. Does this pull request fix one issue?

fixes part of #823

Ⅲ. Describe how you did it

Ⅳ. Describe how to verify it

Ⅴ. Special notes for reviews

[codecov-io]

Codecov Report

Merging #852 into master will decrease coverage by 0.07%.
The diff coverage is 0%.

@@            Coverage Diff            @@
##           master    #852      +/-   ##
=========================================
- Coverage   14.88%   14.8%   -0.08%     
=========================================
  Files         114     115       +1     
  Lines        6821    6857      +36     
=========================================
  Hits         1015    1015              
- Misses       5720    5756      +36     
  Partials       86      86

Impacted Files	Coverage Δ
cli/main.go	0% <0%> (ø)	⬆️
daemon/mgr/container.go	2.79% <0%> (-0.01%)	⬇️
cli/upgrade.go	0% <0%> (ø)
client/container.go	0% <0%> (ø)	⬆️

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[Letty5411]

@HusterWan Could you add a skeleton of test, like api_upgrade_test.go and cli_upgrade_test.go.

[allencloud]

LGTM