Add partial support for GetBucketLifecycle operation

[smallhive]

Closes #1049.

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 7 lines in your changes missing coverage. Please review.

Project coverage is 27.77%. Comparing base (9e27bca) to head (63ec8ed).
Report is 36 commits behind head on master.

Files with missing lines	Patch %	Lines
api/handler/lifecycle.go	0.00%	7 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1064      +/-   ##
==========================================
+ Coverage   26.15%   27.77%   +1.61%     
==========================================
  Files          92       89       -3     
  Lines       15568    15159     -409     
==========================================
+ Hits         4072     4210     +138     
+ Misses      11039    10484     -555     
- Partials      457      465       +8     

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