Goroutines global panic handler

[tonyredondo]

Currently when a test starts a new goroutine, and this goroutine panics, all process crashes without any signal so the data inside the recorder's buffer is lost. This let us without data for the missing tests for that execution and possible failures being hidden by the missing data.

This PR adds a new goroutines global panic handler allowing to fail running tests and flush the recorder buffer before process exit.

When a panic occurs in any goroutine, the following is executed:

1. Panic event!
2. Handlers registered with AddPanicHandler are executed
3. If the panic is handled and recovered by the goroutine the execution continues...
4. If the panic is unhandled the process will crash, before crashing all handlers registered with AddOnPanicExitHandler are executed.
5. Process end with an exit code != 0

For this PR before crashing we finish all running tests with status Fail and write the panic info as an exception in each one.