Secrets notation YAML support

[h1alexbel]

as described here, we should support a YAML secrets notation, consider this example:

id: 5B0185CB-424B-42D4-9631-7B628B7BB78F
...
key: ${value}

In this case, when reading the ${value}, we should fetch the secret called value inside project with id 5B0185CB-424B-42D4-9631-7B628B7BB78F and use it further

[h1alexbel]

@hizmailovich take a look, please