feat(sandbox-controller): support rolling update of sandboxset

[BITLiutianyang]

Ⅰ. Describe what this PR does

Support rolliing update of SandboxSet

Ⅱ. Does this pull request fix one issue?

fixes #76 .

Ⅲ. Describe how to verify it

1. Create a SandboxSet.
2. Update its spec.template, and set spec.updateStrategy as needed. (For now, MaxSurge and MaxUnavailable is supported. They can be an absolute number (ex: 5) or a percentage of desired pods (ex: 10%), and default is 20%. MaxSurge is the maximum number or percentage of pods that can be created above the desired number of pods. MaxUnavailable is the maximum number or percentage of pods that can be unavailable during the update.)
3. The Sandboxes managed by the SandboxSet should be rolling updated according to the update config.

Ⅳ. Special notes for reviews

This PR does not resolve all features mentioned in the issue. It is the first in a series of PRs.

[kruise-bot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

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[kruise-bot]

Welcome @BITLiutianyang! It looks like this is your first PR to openkruise/agents 🎉

[codecov]

Codecov Report

❌ Patch coverage is 76.08696% with 66 lines in your changes missing coverage. Please review.
✅ Project coverage is 68.94%. Comparing base (6d2d715) to head (bef58d2).
⚠️ Report is 27 commits behind head on master.

Files with missing lines	Patch %	Lines
pkg/controller/sandboxset/rolling_update.go	67.39%	38 Missing and 7 partials ⚠️
pkg/controller/sandboxset/sandboxset_controller.go	82.25%	6 Missing and 5 partials ⚠️
pkg/sandbox-manager/infra/sandboxcr/claim.go	72.72%	5 Missing and 1 partial ⚠️
pkg/controller/sandboxset/heap.go	92.68%	2 Missing and 1 partial ⚠️
pkg/sandbox-manager/infra/sandboxcr/sandbox.go	50.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #256      +/-   ##
==========================================
+ Coverage   66.27%   68.94%   +2.66%     
==========================================
  Files         111      114       +3     
  Lines        7418    10319    +2901     
==========================================
+ Hits         4916     7114    +2198     
- Misses       2216     2901     +685     
- Partials      286      304      +18     

Flag	Coverage Δ
unittests	68.94% <76.08%> (+2.66%)	⬆️

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[furykerry]

delete commented code

[furykerry]

/lgtm