[Feature] CNF installation (1), Implement new config format

[kosstennbl]

1st step of #2120.

We need new cnf-testsuite.yml config format that would be able to:

1. Support installation of multiple helm charts
2. Specify which parameters are used for which install methods
3. As a bonus - look more organized and structured.

Currently, idea for structure of new config looks like that (up to change, some parameters may be added/removed):

config_version
common:
    container_names
    white_list_container_names
    docker_insecure_registries
    image_registry_fqdns
    five_g_parameters:
        amf_label
        smf_label
        upf_label
        ric_label
        amf_service_name
        mmc
        mnc
        sst
        sd
        tac
        protectionScheme
        publicKey
        publicKeyId
        routingIndicator
        enabled
        count
        initialMSISDN
        key
        op
        opType
        type 
        apn
        emergency
dynamic:
    source_cnf_dir 
    destination_cnf_dir
    install_method
deployments:
  helm_charts:
	- name
          helm_repo_name 
          helm_repo_url
          helm_chart_name
          helm_values
	  namespace	  
  helm_dirs:
	- name
	  helm_directory
          helm_values
	  namespace
  manifests:
       - name
	 manifest_directory

Scope of this issue is to only prepare config structure and needed code to parse this config, at this point it shouldn't be used for testsuite operations.