feat(plugin-chart-echarts): support show annotation label [ID-8]

[stephenLYZ]

🏆 Enhancements
supports annotation showLabel field. related to apache/superset#17307

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[codecov]

Codecov Report

Merging #1449 (a0f337f) into master (744d732) will increase coverage by 0.06%.
The diff coverage is 50.00%.

@@            Coverage Diff             @@
##           master    #1449      +/-   ##
==========================================
+ Coverage   30.43%   30.49%   +0.06%     
==========================================
  Files         497      498       +1     
  Lines       10013    10027      +14     
  Branches     1692     1694       +2     
==========================================
+ Hits         3047     3058      +11     
- Misses       6720     6721       +1     
- Partials      246      248       +2     

Impacted Files	Coverage Δ
...uperset-ui-core/src/query/types/AnnotationLayer.ts	100.00% <ø> (ø)
...lugin-chart-echarts/src/Timeseries/transformers.ts	42.24% <50.00%> (-1.13%)	⬇️
...ui-chart-controls/src/operators/boxplotOperator.ts	100.00% <0.00%> (ø)
...superset-ui-core/src/query/types/PostProcessing.ts	100.00% <0.00%> (ø)

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[zhaoyongjie]

LGTM