add go/starlark helper methods for dataconv/types types

[hyorigo]

• more helpers on that
• add empty

[codacy-production]

Coverage summary from Codacy

See diff coverage on Codacy

Coverage variation	Diff coverage
✅ +0.03% (target: -1.00%)	✅ 100.00%

Coverage variation details

	Coverable lines	Covered lines	Coverage
Common ancestor commit (4ef73d8)	4714	4376	92.83%
Head commit (f324399)	4735 (+21)	4397 (+21)	92.86% (+0.03%)

Coverage variation is the difference between the coverage for the head and common ancestor commits of the pull request branch: <coverage of head commit> - <coverage of common ancestor commit>

Diff coverage details

	Coverable lines	Covered lines	Diff coverage
Pull request (#105)	26	26	100.00%

Diff coverage is the percentage of lines that are covered by tests out of the coverable lines that the pull request added or modified: <covered lines added or modified>/<coverable lines added or modified> * 100%

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 90.39%. Comparing base (4ef73d8) to head (f324399).

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #105      +/-   ##
==========================================
+ Coverage   90.35%   90.39%   +0.03%     
==========================================
  Files          40       40              
  Lines        4570     4589      +19     
==========================================
+ Hits         4129     4148      +19     
  Misses        332      332              
  Partials      109      109              

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