feature: search the images from specific registry

[hellolijj]

Signed-off-by: Junjun Li junjunli666@gmail.com

Ⅰ. Describe what this PR did

add feature: pouch support search the images from specific registry

Ⅱ. Does this pull request fix one issue?

[feature] pouch cli supports search image

Ⅲ. Why don't you add test cases (unit test/integration test)? (你真的觉得不需要加测试吗？)

Ⅳ. Describe how to verify it

pouch search nginx
pouch search nginx -r https://a.b.com

Ⅴ. Special notes for reviews

1、add parameters in /images/search api
2、are these test cases reasonable？

[codecov]

Codecov Report

Merging #2850 into master will decrease coverage by 0.06%.
The diff coverage is 66.66%.

@@            Coverage Diff             @@
##           master    #2850      +/-   ##
==========================================
- Coverage   69.09%   69.03%   -0.07%     
==========================================
  Files         285      286       +1     
  Lines       17844    17889      +45     
==========================================
+ Hits        12330    12349      +19     
- Misses       4114     4130      +16     
- Partials     1400     1410      +10

Flag	Coverage Δ
#criv1alpha2_test	38.86% <0%> (-0.15%)	⬇️
#integration_test_0	36.49% <0%> (-0.08%)	⬇️
#integration_test_1	35.34% <35.41%> (-0.42%)	⬇️
#integration_test_2	36.55% <0%> (+0.08%)	⬆️
#integration_test_3	35.42% <39.58%> (-0.03%)	⬇️
#node_e2e_test	34.61% <0%> (-0.16%)	⬇️
#unittest	28.53% <27.08%> (ø)	⬆️

Impacted Files	Coverage Δ
client/image_search.go	100% <100%> (ø)
apis/server/image_bridge.go	78.46% <33.33%> (+3.05%)	⬆️
daemon/mgr/image.go	59.89% <61.53%> (+0.44%)	⬆️
pkg/streams/utils.go	82.14% <0%> (-7.15%)	⬇️
ctrd/watch.go	72.97% <0%> (-5.41%)	⬇️
apis/server/utils.go	71.15% <0%> (-3.85%)	⬇️
pkg/meta/store.go	67.44% <0%> (-1.56%)	⬇️
daemon/mgr/container_utils.go	76.76% <0%> (-1.02%)	⬇️
daemon/mgr/container.go	59.72% <0%> (-0.63%)	⬇️
cri/v1alpha2/cri.go	68.81% <0%> (-0.26%)	⬇️
... and 4 more

[hellolijj]

this is my first time to add a feature. i attend to accomplish it step by step.
So, there are many things to be improved. please point it out. thanks a lot 😄

[ZYecho]

@hellolijj any update？ lack of integration test now.

[hellolijj]

all right, i will add it today

[ZYecho]

LGTM

[allencloud]

Thanks for your great work. @hellolijj