Minify: Minified version of the lib

[louismaximepiton]

Note: Please transform - [ ] into - (NA) in the description when things are not applicable

Related issues

Closes #16.
Might resolve or help on #12.

Description

Adding terser as a plugin.

Motivation & Context

Minify the bundle. For now, it goes from 260KB to 45KB.
Several questions came to my mind while doing this:

• Should we provide the two files (ods-charts.js and ods-charts.min.js) ?
• Should we use .min file on the examples or not ?
• Should we use a banner.js/txt file in order to not repeat ourselves on the banner text and ease the maintenance as well ?
• Should we keep the source map or not ? if we should keep it, we might remove: devtool: false.

Types of change

• New feature (non-breaking change which adds functionality)

Test checklist

Please check that the following tests projects are still working:

• docs/examples
• test/angular-ngx-echarts
• test/angular-tour-of-heroes
• test/html
• test/react
• test/vue
• test/examples/bar-line-chart
• test/examples/single-line-chart
• test/examples/timeseries-chart

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[louismaximepiton]

Closing in favor of #311.