Improve collection filter

[mmcfarland]

Adds a client side search index and index the following fields:

• id
• title
• msft:short_description
• cube:variables[standard_name]
• summaries[eo:bands][common_name]
• assets|item_assets[type] (formatted)
• providers

Also optimizes the index build and collection pre-filtering by correctly memoizing based on default function prop values.

Results are now returned in score order, not alphabetically. Based on the current 80+ collections, searches perform typically in under 1ms.

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