Draft: First Tor descriptor API implementation

First Tor descriptor API implementation

This merge request introduces data models for representing Tor descriptors, along with a toolkit for downloading and parsing descriptor files.

Completed

• Bridge pool assignement
• Exit list
• Geo ip file
• Bridgestrap stats
• Directory key certificate
• Tor perf result
• Bandwidth file
• Bridge network status
• Relay server descriptor
• Bridge server descriptor
• Relay extra info descriptor
• Bridge extra info descriptor
• Onion perf
• Relay network status consensus
• Bridge network status consensus
• Geoip names file
• Micro descriptor
• Relay network status
• Relay directory
• Bridgedb metrics

Planned

• Log descriptor