support json parsing to hx-live data proxy

[MichaelWest22]

Description

in hx-live we have a new data proxy and we have found that if we use JSON parse and stringify we can store and retrive data and retain the JSON supported data types like boolean, numeric and arrays. This works well for all data I have tested for except strings of numbers with leading zero which will be converted to a number. But this seems and unlikely edge case and you can work around this by accessing the this.dataset.xxxx directly.

I've also extended q() to have data as a proxy of the data for the first returned element.

Also found parseConfig can use the JSON.parse trick here as well to replace the true, false and numeric handling with a simple json parse. From my testing this works well for all the situations I could find. JSON.parse auto converts true, false and number strings to their real type.

Finally I also extended morphIgnore to handle prefixes with startsWith() as well so that it is possible to easily use this to protect client side data-* attributes if needed.

Corresponding issue:

Testing

added some hx-live tests for the data proxy.

Checklist

• I have read the contribution guidelines
• I have targeted this PR against the correct branch (master for website changes, dev for
  source changes)
• This is either a bugfix, a documentation update, or a new feature that has been explicitly
  approved via an issue
• I ran the test suite locally (npm run test) and verified that it succeeded