feature: remove policy actions

[josedonizetti]

1. Explain what the PR does

Fix #3313

This PR simplifies policies by removing defaultActions, and actions. The multiple actions feature creates a lot of complexity, which is not required.

This allows policy creation without the need to specify any action (default or per event). The default action is always output and will depend on the tracee output config to use file, webhook, fluentd, or multiple printers.

2. Explain how to test it

All the examples below should work:

name: dig
description: traces dns events from the dig binary
scope: 
  - binary=/usr/bin/dig
rules:
  - event: net_packet_dns_request        
  - event: net_packet_dns_response

or, for backward compatibility

name: dig
description: traces dns events from the dig binary
defaultActions:
  - log
scope: 
  - binary=/usr/bin/dig
rules:
  - event: net_packet_dns_request        
  - event: net_packet_dns_response

3. Other comments

[yanivagman]

LGTM