v19.0.0

Release Notes

• feat: config fixed set of API keys (#630, b9fb417)
• feat: replace RPC block interfaces with indexer block data (#638, 8bb33f4)

Config Changes

• move api_key_payment_required -> payment_required
• move special_api_keys -> api_keys.special
• move studio_url -> api_keys.url (including full path)
• move studio_auth -> api_keys.auth
• add option to set api_keys to static JSON payload, for testing
• remove chains
• add chain_aliases for mapping of chain alias to primary chain name