Remove hard-coded check for action$ tag

[anton164]

Currently the extension splits streams into two types base on their tag: :

rxjs-devtools/packages/extension/src/pages/Devtools/Panel/InspectEmissions.tsx

Lines 37 to 41 in c3ed791

	title: 'Type',
	valueRender: (emission => emission.tag === 'action$' ? `Action` : `Tagged stream`)
	}, {
	title: 'Value',
	valueRender: (emission => emission.tag === 'action$' ? emission.value.type : emission.tag)

This split makes sense when using rxbeach, but this split should ideally be handled differently.

Perhaps we should introduce a setting + simple plugin architecture that controls this.