Update ws extension to use htmx.swap

[MichaelWest22]

Description

This possible change update the web socket extension to use htmx.swap as its swapping method instead of insertContent. This allows hx-partial tags and oob swaps to work as normal. Also the ws extension had a custom hx-partial format with id= attribute which did not match with the core htmx hx-partial design so I've updated the core htmx design to allow this natural id format which allows simple use cases like:

<hx-partial id="foo">New Inner Content</hx-partial>

which will just do a default innerHTML swap of the contents of the element with id foo.

This change allows most of the existing ws tests to remain as id only hx-partial's

There is one other breaking change and that is that before the swap style of the active element or from the JSON wrapper would set the default hx-partial swap style which is not how existing hx-partial normal works where each one is treated as innerHTML default and you have to be explicit in its swap method so that hx-partials are fully self contained.

Corresponding issue:

Testing

Updated tests.

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

[stukennedy]

LGTM