Automatic tests for new metadata

[mfornet]

When a new PR is created with the format Add <SYMBOL_OF_YOUR_ERC20_TOKEN> metadata trigger some automatic tests to avoid merging invalid metadata, or invalid format. This will improve significantly workflow for the reviewer.

This is list (potentially non-comprehensive) of required tests for a PR to be approved.

• Ethereum address must exist
• Ethereum address must have proper checksum (online tool for this: https://ethsum.netlify.app/)
• ?Aurora address must exist?
• ?Aurora address must have proper checksum?
• name must match metadata from ethereum
• symbol must match metadata from ethereum
• decimals must match metadata from ethereum
• icon data must match svg file
• icon is a optimized svg as suggested in the standard (in particular it should be less than 8kb)
• NEP-141 has aurora registered for storage