docs(examples): Add availibility to choose between canvas and svg

[jacques-lebourgeois]

Description

In exemple pages add a selector for the renderer SVG or CANVAS

Motivation & Context

Test and see that theme configurator works fine with both SVG and CANVAS

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-echarts
• test/html
• test/react
• test/vue
• test/examples/bar-line-chart
• test/examples/single-line-chart
• test/examples/timeseries-chart

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