feat(plugin-word-cloud): change how wordcloud is exported

[kristw]

💔 Breaking Changes

Old behavior

exports default WordCloudChartPlugin from index.

import WordCloudChartPlugin from '@superset-ui/plugin-chart-word-cloud';

users need to deep import /esm/legacy to get the legacy version.

import LegacyWordCloudChartPlugin from '@superset-ui/plugin-chart-word-cloud/esm/legacy';

New behavior

exports both WordCloudChartPlugin and LegacyWordCloudChartPlugin from index.

import { WordCloudChartPlugin, LegacyWordCloudChartPlugin } from '@superset-ui/plugin-chart-word-cloud';

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[codecov]

Codecov Report

Merging #418 into master will increase coverage by 0.03%.
The diff coverage is 33.33%.

@@            Coverage Diff             @@
##           master     #418      +/-   ##
==========================================
+ Coverage   22.25%   22.28%   +0.03%     
==========================================
  Files         261      261              
  Lines        6474     6474              
  Branches      587      587              
==========================================
+ Hits         1441     1443       +2     
+ Misses       4996     4994       -2     
  Partials       37       37              

Impacted Files	Coverage Δ
.../plugin-chart-word-cloud/src/legacyPlugin/index.ts	33.33% <ø> (ø)
...hart-word-cloud/src/legacyPlugin/transformProps.ts	54.54% <ø> (ø)
...s/plugin-chart-word-cloud/src/plugin/buildQuery.ts	100.00% <ø> (ø)
...ugin-chart-word-cloud/src/plugin/transformProps.ts	0.00% <ø> (ø)
...lugins/plugin-chart-word-cloud/src/plugin/index.ts	33.33% <33.33%> (ø)

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