SSE Extension: Add support for `hx-select`

[scriptogre]

You can now use hx-select to select a portion of HTML from an SSE event to swap, just like you can with hx-get or hx-post.

Example:

Server Event:

data: <div id="message">Hello</div><div id="status">Online</div>

You can now select and swap just the #message div:

HTML:

<div sse-connect="/events" sse-swap="message" hx-select="#message">
<!-- This div will be updated with the content of #message -->
</div>

Htmx version: 2.0.6 Used extension(s) version(s): 2.2.2

Checklist

• [x] I have read the contribution guidelines
• [x] I ran the test suite locally (npm run test) and verified that it succeeded

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