[BCN]: Add Optimism, Arbitrum, and Base support

[leolambo]

• Supports the labeling and use of realtime and historical only rpc providers.
• Supports serving chain state from external providers.
• Supports Arbitrum, Base, and Optimism chains.
• Adds scaffolding for External Sync. (Full functionality in subsequent PR)
  • External Sync is designed to sync a chain based on a parameters set in the config
  • This is helpful for sparse syncing. i.e sync 1 transaction every 5 minutes or syncing ONLY blockNumber / 1000
  • Maintaining sparse data for certain chains can help minimize external rpc calls while using minimal storage
  • External Sync is a child of P2P

TESTING

Setup your bitcore.config.json for desired chains.

• chainSource must be 'external' to use external providers, see bitcore-test.config.json
• for valid config values, see packages/bitcore-node/src/types/Config.ts
• Moralis only works for Eth, Matic, Base testnet's but works for all mainnets.

Send GET and POST requests for new chains to your BCN