Add new functions for styles

Add new HTML parser for Shadow DOM

**Added**
- Add parser for web component/shadow DOM

**Changed**
- `createTrustedHTMLTemplate` now throws if not given a `TrustedTypePolicy`

Add `createTrustedHTMLTemplate()`

Various dependency updates

Misc dependency updates

Remove polyfills & misc updates

**Added**
- Add support for stringifying of `AbortSignal` and `AbortController` using `@aegisjsproject/callback-registry`

**Changed**
- Various lib updates

**Fixed**
- Remove duplication of Trusted Types Policy for sanitizer (removed polyfills)

Switch to using `@aegisjsproject/callback-registry`

**Changed**
- Use `@aegisjsproject/callback-registry` instead of own registry

**Removed**
- Do not include `attributeObserver.js` in default export/bundles

Fix stringifying elements

Add unsafe `html` and `doc` methods

**Added**
- Add unsafe versions of `html` and `doc` via `setHTMLUnsafe` and `parseHTMLUnsafe`

**Changed**
- Upadte `@aegisjsproject/parsers`

Various updates for compatibility with new/updated dependencies