refactor(types): more precision

[wmertens]

Specifics:

• piggyback on TS HTML types as much as possible (now automatically supports new props like popover)
• Remove QwikEvents and SyntheticEvents, they are really just DOM events
• improve QRL and QRLInternal types for better matching
• useOn* now can infer type and the passed element is also typed
• move the QRL AbortSignal to server$, the only place where it's supported
• generic parameter to useDocumentHead for the frontmatter
• DOM ref={} functions get the type of the element

Generic:

• add some tests for the types
• use unknown or actual type instead of any where possible
  • if not used as part of an extends test, it's probably ok to change any to unknown. It will surface type mismatches.
• fix function signatures so they can match extends ( (...args: any) => any instead of (...args: any[]) => any
• change some interfaces to types if they're not meant to be merge-extended and they're not extending (interfaces have a performance advantage there)
• add jsdoc comments

Actual code changes:

• In use-task.ts, allow track(signal) inside a task
• in docs, remove useless filtering from class array
• changed some hardcoded strings to constants

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[gioboa]

🤯 what a great work. you rock