feat: add nullMode for area, bar-x, bar-y, heatmap, line, pie, scatter, waterfall charts

[arteria32]

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[gravity-ui-bot]

Preview is ready.

[gravity-ui]

Visual Tests Report is ready.

[arteria32]

Hi, @korvin89, @kuzmadom
I prepared a first draft for null handling for all chart types (imho, for each type that it is relevant). Can you see my implementation, review, or discuss the desired feature state?

[korvin89]

@arteria32 Hey! First of all - thank you for contribution!

We have discussed your PR with @kuzmadom and wanna ask you to make some corrections:

1. Rename nullHandling in this way:

type SomeSeries = {
  // ...
  **
   * @property nullMode - How to handle null/undefined values
   * - 'skip': omit the data point (creates gap in line, no bar shown)
   * - 'zero': treat as zero value
   * - 'connect': connect points across null (line/area only)
   */
  nullMode: 'skip' | 'zero' | 'connect'
  // ...
};

2. Fix 2 failing tests
3. Fix bar-x story, it's very difficult to see the changes right now
4. Fix scatter story, now something is going wrong there because the beginning of the countdown for unix time appears
5. Move data for stories to __data__
6. Add tests for all cases you added stories for

[arteria32]

• Fix 2 failing tests

done

*Fix bar-x story, it's very difficult to see the changes right now

I have simplified all the stories for the null mode demo.

Fix scatter story, now something is going wrong there because the beginning of the countdown for unix time appears

I have forbidden null values for datetime axes in the validation function. I believe that zero replacement or skipping mode is not suitable for this type.

Move data for stories to data

Done

Add tests for all cases you added stories for
Done