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Add tokenURI support to ERC721App
The ERC721App currently ignores the tokenURI of the NFT. Supporting the tokenURI requires SCALE encoding of arbitrary length strings on Ethereum. Arbitrary length strings require a compact SCALE encoded length prefix, which we don't have currently implemented.
Originally posted by @musnit in https://github.com/Snowfork/snowbridge/pull/496#discussion_r691093432