feat: data source abstraction

[Vardominator]

Motivation

Laser Eyes is quickly becoming the standard wallet interface for Bitcoin-based dapps. Maestro would like to become the go-to data source for Laser Eyes and thereby support all dapps that use this framework.

Part 1

Abstract mempool.space, sandshrew and Maestro into a data source interface

• Implement generic data source interface with common inputs and response schemas
• Implement existing sources: mempool.space, Sandshrew
• Implement Maestro source
• Add config logic for selecting source and setting a Maestro API key

Implement existing methods for the Maestro source

• getTransaction
• getRawTransaction
• getRecommendedFees
• getOrdAddress
• getRuneById
• getRuneByName

Other general improvements

• Move constants/networks.ts to types/network.ts and use enums
• Move constants/protocols.ts to types/protocol.ts and use enums

Part 2 (future PR)

Implement the following endpoints on the Maestro side and add to Maestro source

• Runes management
  • Create Rune Etch
  • Create Rune Mint
  • Create Rune Send
• Inscriptions management
  • Inscribe content
  • Get commit PSBT
  • Execute reveal transaction
  • Create inscription script
  • Create inscription reveal address and keys
• Recommended fees

Part 3: Rejoice