feat: minFileCount option on RouteConfig

[markflorkowski]

Addresses #710

• add minFileCount option to RouteConfig
• update docs to include minFileCount

To do:

• [ ] typescript (validate that minFileCount <= maxFileCount)
• [ ] test -- add test for ^^
• [x] confirm expected behaviour (should min be 0, or should it be 1?)

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Name	Status	Preview	Comments	Updated (UTC)
docs-uploadthing	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Apr 4, 2024 9:58am

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🦋 Changeset detected

Latest commit: 3dddbf5e5da95ddc9305fdef610810dcbe825c12

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 4 packages

| Name | Type | | ------------------- | ----- | | @uploadthing/shared | | | uploadthing | | | @uploadthing/react | Major | | @uploadthing/solid | Major |

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