Add grpc server

[josedonizetti]

1. Explain what the PR does

This PR is part of the work to support a v1 for GRPC. It adds the base grpc server, implementing the version endpoint defined on the tracee rpc proto, the grpc server can be start to listen on TCP or UDS.

2. Explain how to test it

./dist/tracee --grpc-listen-addr=tcp:4466

A simple GRPC client if you want to test it:

package main

import (
	"context"
	"log"

	pb "github.com/aquasecurity/tracee/types/api/v1beta1"
	"google.golang.org/grpc"
	"google.golang.org/grpc/credentials/insecure"
)

func main() {

	var opts []grpc.DialOption
	opts = append(opts, grpc.WithTransportCredentials(insecure.NewCredentials()))

	conn, err := grpc.Dial(":4466", opts...)
	if err != nil {
		log.Fatalf("fail to dial: %v", err)
	}

	client := pb.NewTraceeServiceClient(conn)

	version, err := client.GetVersion(context.Background(), &pb.GetVersionRequest{})
	if err != nil {
		log.Fatal(err)
	}

	log.Printf("version: %+v\n", version.Version)
}

3. Other comments

depends on #3389

[geyslan]

Awesome!

Tested with TCP and Unix socket:

sudo ./dist/tracee --grpc-listen-addr=tcp:4466

sudo ./dist/tracee --grpc-listen-addr=unix:unix_sock