feat(java,info): support multi-labels in yaml

[yangxk1]

Reason for this PR

close #779

What changes are included in this PR?

Are these changes tested?

Are there any user-facing changes?

[codecov-commenter]

Codecov Report

❌ Patch coverage is 64.10256% with 14 lines in your changes missing coverage. Please review.
✅ Project coverage is 76.40%. Comparing base (919818b) to head (59c6a80).

Files with missing lines	Patch %	Lines
.../main/java/org/apache/graphar/info/VertexInfo.java	52.63%	7 Missing and 2 partials ⚠️
.../apache/graphar/info/saver/BaseGraphInfoSaver.java	37.50%	3 Missing and 2 partials ⚠️

Additional details and impacted files

@@ Coverage Diff @@ ## main #781 +/- ## ============================================ - Coverage 76.75% 76.40% -0.35%  - Complexity 562 575 +13  ============================================ Files 83 83 Lines 8800 8751 -49 Branches 1032 1015 -17 ============================================ - Hits 6754 6686 -68  - Misses 1826 1843 +17  - Partials 220 222 +2 

Flag	Coverage Δ
java-info	82.40% <64.10%> (-0.33%)	⬇️

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[yangxk1]

Hey @Thespica, please help me review.