refactor: Deprecate conditionalSlot utility and getSlotted method

[driskull]

Related Issue: #

Summary

refactor: Deprecate conditionalSlot utility.

• Deprecates conditionalSlot utility class in favor of hasAssignedElement dom utility.
  • There's no need to setup mutation observers and forceUpdate when onSlotchange works perfectly.
  • The conditionalSlot utility class will not work if ComponentA slots into a slot in ComponentB.
• Deprecates getSlotted utility function in favor of onSlotChange.

Example: Component has slotted elements

import { hasAssignedElement } from "../../utils/dom";

@State() mySlotHasElement: boolean;

<slot onSlotchange={(event) => this.mySlotHasElement = hasAssignedElement(event)) />}

Example: Getting slotted elements

import { getAssignedElements } from "../../utils/dom";

@State() mySlotElements: Element[];

<slot onSlotchange={(event) => this.mySlotElements = getAssignedElements(event)) />}

[github-actions]

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[driskull]

@jcfranco I can haz install?

[jcfranco]

Very nice! Good to merge once the new utils have tests.