Add support for parsing arrays into base64 strings in the URL.

[harrisrobin]

Hi, first off all, thank you for writing this lib @franky47 , it's been a real life saviour!

While running into a use case where I need to keep state in the URL, I noticed that having objects in the URL break in certain messaging apps like whatsapp, telegram and kakaotalk (that's all i've tested).

As a result, I opt-ed to store my arrays as a base64 string in the URL, which works quite well for my use-case. I don't know if this is something other people seek, but wanted to make a PR incase it's of any interest.

I tried to keep it very close to parseAsArrayOf:

  const [selectedTags, setSelectedTags] = useQueryState(
    "selectedTags",
    parseAsBase64ArrayOf(parseAsJson<TagOption>()).withDefault([]),
  )

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