Node address api proxy banning burn address

[r4mmer]

Summary

Currently, if an address takes too long to load on the proxy api for addresses it is banned as to not create an unnecessary load on the explorer full-node.

This ban should not be applied to the burn address.

Possible solutions

1. Do not make calls with timeout if it's the burn address (would need to increase the lambda timeout as well).
2. On the explorer, search directly on the full-node if it's the burn address.
3. Have a service listening to the full-node and updating the burn address result so that the explorer-service can serve the cached result.