explorer: Add token page

[HDauven]

Summary

Currently, we do not display third party contracts in our explorer. For the EMT implementation it is required to have an overview page for the token.
This page should display:

• The current total supply
• The circulating supply
• Transfer history for the given token

Possible solution design or implementation

We want something similar to what Etherscan provides: https://etherscan.io/token/0xdac17f958d2ee523a2206206994597c13d831ec7

Currently, there's no API to gather the transaction history for a given token contract. We could do this by filtering on the transactions payload -> call -> contract.

Possible endpoint format:
https://apps.dusk.network/explorer/contract/?id=<CONTRACT_ID>
https://apps.dusk.network/explorer/token/?id=<CONTRACT_ID>