Heatmap: Add Cividis and Turbo color schemes

[abursavich]

What this PR does / why we need it:

This adds two new heatmap color schemes: Cividis and Turbo.

Which issue(s) this PR fixes:

N/A

Special notes for your reviewer:

The dependency diff is straightforward: d3/d3-scale-chromatic@v1.3.3...v1.5.0

[abursavich]

https://circleci.com/gh/grafana/grafana/138367

>> Summary of all failing tests
>> FAIL public/app/plugins/datasource/elasticsearch/specs/datasource.test.ts
>>   ● ElasticDatasource › When testing datasource with index pattern › should translate index pattern to current day
>> 
>>     expect(received).toBe(expected) // Object.is equality
>> 
>>     Expected: "http://es.com/asd-2019.08.25/_mapping"
>>     Received: "http://es.com/asd-2019.08.24/_mapping"
>> 
>>       79 | 
>>       80 |       const today = toUtc().format('YYYY.MM.DD');
>>     > 81 |       expect(requestOptions.url).toBe('http://es.com/asd-' + today + '/_mapping');
>>          |                                  ^
>>       82 |     });
>>       83 |   });
>>       84 | 
>> 
>>       at Object.<anonymous> (public/app/plugins/datasource/elasticsearch/specs/datasource.test.ts:81:34)
>> 
>> 
>> Test Suites: 1 failed, 266 passed, 267 total
>> Tests:       1 failed, 1 skipped, 2211 passed, 2213 total

I'm pretty sure this failure isn't caused by this change.

[ryantxu]

ya -- it is super annoying #18054

[ryantxu]

LGTM -- will wait for CI to pass