[Improvement] Optimize events handling and migrate to official docker client

[stokito]

In connector/docker.go:67 to subscribe to events ctop uses AddEventListener() from fsouza/go-dockerclient.
The problem is that there is a lot of types of events so ctop filters out all except of events with container type:

if e.Type != "container" {
	continue
}

In fact docker Monitor Events API has a param filters that can be set to {"type":["container"]} to subscribe only to container events.
If we'll use then we may improve performance and remove the if e.Type != "container" { continue } line.
The problem is that the fsouza/go-dockerclient doesn't have a binding to filter param. We can create a PR but the go-dockerclient package seems obsolete and "was created before Docker had an official Go SDK. For new projects, using the official SDK is probably more appropriate as go-dockerclient lags behind the official SDK".
The official Docker Go SDK already supports the filters param:

• https://pkg.go.dev/github.com/docker/docker/client#Client.Events
• https://pkg.go.dev/github.com/docker/docker@v1.13.1/api/types#EventsOptions

So what do you think about to migrate to Official Docker SDK? If we migrate then we can the filters param.
As far I see ctop uses only few API calls and can be easily migrated to Official SDK but maybe I don't know something.