Use plotly.js `base64` API to store and pass typed arrays declared by numpy, pandas, etc.

[archmoj]

This PR make use of this plotly.js PR and changes the default behavior to pass numpy arrays as plotly.js base64 spec.

Code Changes

• Adds to_typed_array_spec function to use for converting numpy arrays to the "typed array spec" type that plotly.js expects when receiving base64 encoded arrays.
• Updates the validate_coerce function of the DataArrayValidator class to base64 encode numpy arrays and store them in the "typed array spec" format (by calling to_typed_array_spec)
• Adds thorough testing to validators
• Adds performance (size and speed) tests

[marthacryan]

(Closed and reopened to kick CI)

[archmoj]

@marthacryan Please resolve the conflicts with master; then merge master into this branch. Then you may possibly copy the version of tests from master into this branch to see if any tests need any adjustments. Thank you!

[gvwilson]

thank you everyone

[alippai]

Should this work for SVG render mode too? (render_mode="svg" in px.line)

[gvwilson]

cc @marthacryan @emilykl for an answer