Remove the relevant validation for classID and nftID from x/nft

[dreamer-zq]

Summary

Remove the relevant validation for classID and nftID from x/nft

Problem Definition

The current x/nft module in cosmos-sdk restricts the format of classID and nftID [a-zA-Z][a-zA-Z0-9/:-]{2,100}, which is not friendly to upper-layer applications , for example, the tokenId defined in eip-721 is uint256, etc. When using ics721 for nft cross-chain, the receiving chain (using the x/nft module) may not be able to perform related operations on nft, such as query, transfer, etc., which restricts usage scenarios

Proposal

so It is recommended to delete the relevant verification of classID and nftID from x/nft, and the specific verification logic is controlled by the upper-layer application