Add CrossVM views

[sisyphusSmiling]

Closes: #242
Related: onflow/flow-evm-bridge#164

Description

• Adds views as proposed in VM Bridge Support for Cross-VM NFTs flips#318 in a new contract CrossVMMetadataViews
• Updates flow.json

---

For contributor use:

• Targeted PR against master branch
• Linked to Github issue with discussion and accepted design OR link to spec that describes this work.
• Re-reviewed Files changed in the Github PR explorer

[joshuahannan]

Would you be able to add examples of these to ExampleNFT and add some tests?

[sisyphusSmiling]

@joshuahannan I've added implementation into ExampleNFT and tests. lmk if you think those are sufficient.

Cadence tests are passing locally, but CI is failing on the go tests. I think I'll have to get the EVM contract into the go test env as they're failing locally as well.

We can also add more use case specific examples for Cadence- and EVM-native NFT collections once the bridge changes are complete.

[sisyphusSmiling]

I've removed the original example view resolution in ExampleNFT which attempted to serialize using the SerializeMetadata contract to try and unblock myself here.

Looks like CI is failing due to the changes in the ExampleNFT. When emulator is bootstrapped, it deploys ExampleNFT (ref) and since the contract in this repo now requires two new imports, the bootstrap fails. Not sure how to get around this @joshuahannan as this is a bit circular.

tbh I'm surprised emulator includes a non-critical contract when setting up the environment.

[joshuahannan]

Yeah, this happens sometimes. We'll just need to tag a prerelease based on this branch and use that in flow-go, then when the emulator is updated, we can merge this.

We need to do that anyway with my core contracts PR. I'm sure there is a better way around this, but I don't know either.

[joshuahannan]

Another option would be to add a separate contract getter to the contracts package to get the new contract, and use that to test. Probably should do that actually so we can still make sure the go tests are passing