[FEATURE]: use http route name not path for websocket span resource name

[chiawendt]

Package Name

datadog-plugin-ws

Package Version(s)

No response

Describe the feature you'd like

Currently websocket.receive spans use http path as resource name, which is not suitable as resource names should have low cardinality and normalized (I think). Using http route seems better.

Reference implementation for http server spans:

dd-trace-js/packages/dd-trace/src/plugins/util/web.js

Lines 516 to 527 in bae4e64

	function addResourceTag (context) {
	const { req, span } = context
	const tags = span.context()._tags
	if (tags['resource.name']) return
	const resource = [req.method, tags[HTTP_ROUTE]]
	.filter(Boolean)
	.join(' ')
	span.setTag(RESOURCE_NAME, resource)
	}

Is your feature request related to a problem?

No response

Describe alternatives you've considered

No response

Additional context

No response