Fuzz v3 hidden services

If we want the fuzzer to effectively fuzz v3 hidden services, we need to:

• fuzz GET requests: legacy/trac#21476 (moved)
• fuzz POST requests: legacy/trac#21478 (moved)
• add v3 GET and POST requests to the fuzzing corpus
• add tokens from v3 GET and POST requests as new fuzzing token lists
• disable the encrypted connection check when fuzzing (we should do this for v2 services as well)
• create a v3 descriptor fuzzer
• add v3 descriptor examples to the fuzzing corpus
• add tokens from v3 descriptors as a new fuzzing token list