Firo I2P hidden services

[reubenyap]

PR intention

This PR adds I2P support to Firo, allowing nodes and wallets to operate as I2P hidden services. This enhances privacy and censorship resistance for Firo users, addressing the requirements outlined in GitHub issue #1641.

Code changes brief

• Network Stack Integration: Introduced NET_I2P network type and updated CNetAddr and CService to parse and handle I2P .b32.i2p addresses using a "GarliCat" IPv6 prefix for internal representation.
• Configuration Options: Added -i2psam=<ip:port> and -i2pacceptincoming command-line options for I2P SAM proxy configuration.
• Documentation: Created doc/i2p.md with comprehensive setup, configuration, and usage instructions.
• Testing: Added unit tests in src/test/netbase_tests.cpp to validate I2P address parsing and network properties.

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✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch cursor/firo-i2p-hidden-services-f4b6

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