* Add JWT support to TokenSign
* Encapsulate OpenSSL public/private key type
Type-safe passing around of keys without having to DER/PEM-serialize
(OpenSSL doesn't have distinct types for public and private key)
* Apply Clang format
* Add verify benchmark for JWT and FlatBuffers token
* Unit test base64url::{encode, decode}
* Make all payload fields optional
Let user code validate non-signature fields
* Make all payload fields optional
Completely defer field check to user code
* Move rapidjson from fdbclient to contrib
* Make fdbrpc's rapidjson linkage private
Currently only sources include them.
* Modify rapidjson path in apiversioner.py
* Algorithm::Unknown > Algorithm::UNKNOWN
TokenSign was copying unused Arena held by Standalone instead of refering to it.
An Arena has to be used at least once before it holds a valid, copyable reference.
Otherwise the lifecycle of the copied Arena would be its own and not be shared with the original.
Thus, when the copied arena went out of scope,
the memory supposed to be held by returned Standalone also got released.
Fix: instead of copying, refer to Standalone's arena.
Junhyun Shim