Release v0.22.0

• Since firecracker-microvm/firecracker#2125, cargo build doesn't build jailer by default. (#263)
• Fix Benchmark Goroutine (#259)
• Jailer configuration API cleanup and improved logging with Debug log level (#255)
• Firecracker is internally has an instance ID, but the SDK didn't have the way to configure the ID. This change connects Config.VMID to the instance ID. (#253)
• Fixed error that was not being test against in TestWait (#251)
• Fixes issue where socket path may not be defined since the config file has yet to be loaded (#230)
• Fixed error that was not being test against in TestNewPlugin (#225)
• Download Firecracker 0.21.1 and its jailer from Makefile (#218)