Add turbo load integration (re-render chart)

[mandyHahn]

Based on the patch posted here: #88 (comment)

Update defer in renderer.rb to add an event listener for turbo:load.

• creates chart on either turbo:load or load
• on creating chart, adds an event listener for turbo:before-chache to destroy the chart before frame reload
• charts are not rendered during turbo preview states

Added test to check for turbo integration.

Note: Not tested with turbo_streams, but based on documentation does not support partial page updates via turbo_stream.

Should work whether turbo is used or not.

[styd]

@exterm @mandyHahn Do you guys use this ruby gem at Clockwork? If so, can you update the README to add your company in a new PR? Thank you.

[exterm]

🎉