chore(dts): generate bundled dts distribution

[pissang]

Brief Information

This pull request is about adding dts bundle in the npm distribution.

What does this PR do?

Generate a clean DTS bundle

It will generate a dts bundle types/dist/echarts.d.ts with rollup-plugin-dts plugin. And the default type entry will be changed to this file. This bundle can also be used in https://github.com/apache/incubator-echarts-examples for type checking

This change will simplify the types exposed to developers. To avoid inner module having errors when ts version is not compatible. Like issue #13541

To make sure no more inner module like ComponentModel, ComponentView, Grid will be exposed. This PR also made some changes to the type structure.

Test generated DTS bundle

This PR includes a test case for testing the compatibility of different ts versions. It will test ts versions from 3.4 to the latest( which is 4.0 at the moment this PR is created. Which means the lowest ts version our dts supported is 3.4.

Test command:

npm run test:dts

Fix some type issue in other ts versions

[echarts-bot]

Thanks for your contribution!
The community will review it ASAP. In the meanwhile, please checkout the coding standard and Wiki about How to make a pull request.

The pull request is marked to be PR: author is committer because you are a committer of this project.

[echarts-bot]

Congratulations! Your PR has been merged. Thanks for your contribution! 👍