fix: build/type issue with DataGenerator

[nickofthyme]

Summary

Bug caused by DataGenerator Class now expecting a random number generator. Broke EUI docs.

• Move around types to exclude mocks directory
• Remove import of seedrandom from dist files
• Add default rng function for DataGenerator

We should move pallettes.ts out of mocks/ all prevent any src code in this directory, might be best to move it to the root folder or in a testing utils root directory.

Checklist

• Any consumer-facing exports were added to src/index.ts (and stories only import from ../src except for test data & storybook)
• This was checked for cross-browser compatibility, including a check against IE11

[codecov-io]

Codecov Report

Merging #671 into master will decrease coverage by 0.05%.
The diff coverage is 30.76%.

@@            Coverage Diff             @@
##           master     #671      +/-   ##
==========================================
- Coverage   72.97%   72.91%   -0.06%     
==========================================
  Files         266      266              
  Lines        8634     8641       +7     
  Branches     1698     1700       +2     
==========================================
  Hits         6301     6301              
- Misses       2294     2301       +7     
  Partials       39       39              

Impacted Files	Coverage Δ
...hart_types/partition_chart/layout/config/config.ts	68.75% <ø> (ø)
...types/partition_chart/layout/types/config_types.ts	100.00% <ø> (ø)
...rtition_chart/layout/viewmodel/link_text_layout.ts	19.04% <0.00%> (ø)
src/utils/data_generators/simple_noise.ts	100.00% <ø> (ø)
src/utils/data_generators/data_generator.ts	44.44% <22.22%> (-10.73%)	⬇️
...ypes/partition_chart/layout/viewmodel/viewmodel.ts	89.23% <100.00%> (ø)
src/mocks/utils.ts	94.11% <100.00%> (ø)
... and 1 more

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[markov00]

LGTM

[markov00]

🎉 This PR is included in version 19.3.0 🎉

The release is available on:

• GitHub release
• npm package (@latest dist-tag)

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