WiP use yqlib for yaml parsing and processing

[ndeloof]

This is an experiment to use yblib to load compose files

this will replace the existing logic:

1. parse yaml file (goyaml.v2) into map[string]interface{}
2. interpolate variables
3. map to go structures (using mapstructure) and transform "short" into "long" syntax
4. merge config files from go structures (mergo)

by

1. parse yaml files (goyaml.v3) using yqlib
2. merge yaml trees
3. interpolate variables
4. transform "short" into "log" syntax
5. map yaml tree to go structs

beenfits using yqlib:

• yq is a popular, battle-tested yaml processing command line
• yq fully supports file merges, both with "override" and "append" logic
• yq uses a navigation syntax (same as jq) to select nodes in the yaml tree, we can use to define transformation logic. Typically ".services.*.ports.[]": transformPorts
• yq is up-to-date and uses goyaml.v3

this will also help implement compose-spec/compose-spec#284 as we can detect an null node and override, while mergo comes to late to distinguish null vs default value.