Add EVMBridgedMetadata implementation into ExampleNFT

[sisyphusSmiling]

Issue To Be Solved

With the introduction of the EVM bridge, Cadence projects may want control over the identifying characteristics of how their bridged NFTs are represented. The EVMBridgedMetadata view was introduced in #203 and an example implementation is needed to demonstrate how the view could be used to resolve contract and asset level metadata on NFTs upon bridging.

Suggest A Solution

Add resolution of EVMBridgedMetadata into v1 and v2 ExampleNFT implementations.