feat: add plugin for Kepler

[mistercrunch]

Trying to create plugin for kepler migrating the code from apache/superset#6403

Hitting a blocker:

Has to do with this line:
https://github.com/uber-web/type-analyzer/blob/master/src/utils.js#L106

I'm confused by the error, and guessing that our babel configuration doesn't like pre-ES6 imports. Also a bit confused by the symlinking and why the import of type-analyzer wouldn't use some compiled version of that lib...

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[kristw]

If Kepler will be the only plugin in this preset you could make this be legacy-plugin-chart-kepler.
See https://github.com/apache-superset/superset-ui-plugins-template/tree/master/packages for examples

[kristw]

For the error, if you can yarn build in this repo successfully then it will have to do with webpack config in incubator-superset.

Look for this line in webpack.config.js in incubator-superset and add type-analyzer to include regex.

        // handle symlinked modules
        // for debugging @superset-ui packages via npm link

Anyway, if you can yarn build successfully, this should affect only testing with npm link but not affect when importing the package normally after it has been published to npm.

[codecov]

Codecov Report

Merging #2 into master will not change coverage.
The diff coverage is n/a.

@@         Coverage Diff          @@
##           master    #2   +/-   ##
====================================
  Coverage      75%   75%           
====================================
  Files           1     1           
  Lines           4     4           
====================================
  Hits            3     3           
  Misses          1     1

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[khtruong]

👀 @mistercrunch @betodealmeida

[betodealmeida]

LGTM