Add umi-uploader-cascade plugin

[mastercodercat]

Add umi-uploader-cascade plugin implementing Pastel Network's Cascade Protocol upload method

This PR introduces a new plugin, umi-uploader-cascade, which integrates the upload method based on Pastel Network's Cascade Protocol (https://cascade.pastel.network/). This plugin extends the functionality of the project by enabling seamless integration with the Cascade Protocol for media / metadata uploads.

[changeset-bot]

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Latest commit: e84c9e2

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