Improve query filter thing

[oskarrough]

Goals

• Refactor array query params from ?filter=[1,2] to ?filter=1&filter=2. This is more in line with how URLSearchParams works
• Replace orderConfig query param with postgrest style e.g. ?order=created_at or ?order=created_at.asc/desc (defaults to descending since we mostly have newest first)
• Add new ?search shortcut param that adds a full-text style search filter behind the scenes
• Do not add new query params with default values to the URL. Only add when they are overwritten

More goals

• Refactor and extract the query params handling across base-channel.js, base-channels.js, explore + tracks pages
• Allow "pages" to set default query params values??
• URLSearchParams -> r4-router -> route component -> updateSearchParams(...) -> navigationEvent -> re-render

[oskarrough]

Consider merging https://github.com/radio4000/components/pull/156 into this one first.