Report JSON-RPC calls panics to Sentry

[igor-sirotin]

We use go-ethereum implementation of JSON-RPC server which internally recovers from panics:

status-go/vendor/github.com/ethereum/go-ethereum/rpc/service.go

Lines 194 to 203 in fc836e4

	// Catch panic while running the callback.
	defer func() {
	if err := recover(); err != nil {
	const size = 64 << 10
	buf := make([]byte, size)
	buf = buf[:runtime.Stack(buf, false)]
	log.Error("RPC method " + method + " crashed: " + fmt.Sprintf("%v\n%s", err, buf))
	errRes = &internalServerError{errcodePanic, "method handler crashed"}
	}
	}()

And I don't see direct way of intercepting this error or changing this behaviour.

There're 2 ways to go:

1. Update our geth's fork and remove this recover.
2. Switch JSON-RPC server library

I prefer the latter.