feat: support depends_on

This PR supports the extended pattern of `depends_on`. If the short version of
`depends_on` is defined, it will be migrated to the extended version like the
example below:

```yaml
services:
  web:
    depends_on
    - database

services:
  web:
    depends_on:
      database:
        condition: service_started
```

All three types of merging strategies are supported.

go.mod

@@ -5,7 +5,7 @@ go 1.20
 require (
 	github.com/spf13/cobra v1.9.1
 	github.com/stretchr/testify v1.10.0
-	gopkg.in/yaml.v2 v2.4.0
+	gopkg.in/yaml.v3 v3.0.1
 )
 
 require (
@@ -13,5 +13,4 @@ require (
 	github.com/inconshreveable/mousetrap v1.1.0 // indirect
 	github.com/pmezard/go-difflib v1.0.0 // indirect
 	github.com/spf13/pflag v1.0.6 // indirect
-	gopkg.in/yaml.v3 v3.0.1 // indirect
 )