Remove strict dependency on coordinate arrays

[katamartin]

This PR removes the strict requirement that all coordinate arrays be included in the store and fetched by ncview-js. Note that spatial coordinates are always required and non-spatial coordinates are still required for pyramid stores.

• When a coordinate is not fetched, we fallback to rendering just the coordinate index information
• When a non-spatial coordinate array (e.g., time) is missing:
  • We skip the get_array initialization step on the FetchStore
  • Show a missing message in the ArrayMetadata table
• When a coordinate array is too large (over 1000000 values)
  • We skip fetching the array data via array.get_chunk()
• Unrelated update caught in this PR: avoid showing a full time series when there is only a single data point in the regional plot

Closes #47

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Name	Status	Preview	Comments	Updated (UTC)
data-viewer	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Jan 15, 2025 8:31pm