feat(encoding): Add toml codec

Signed-off-by: Mark Sagi-Kazar <mark.sagikazar@gmail.com>

internal/encoding/toml/codec.go

@@ -0,0 +1,45 @@
+package toml
+
+import (
+	"github.com/pelletier/go-toml"
+)
+
+// Codec implements the encoding.Encoder and encoding.Decoder interfaces for TOML encoding.
+type Codec struct{}
+
+func (Codec) Encode(v interface{}) ([]byte, error) {
+	if m, ok := v.(map[string]interface{}); ok {
+		t, err := toml.TreeFromMap(m)
+		if err != nil {
+			return nil, err
+		}
+
+		s, err := t.ToTomlString()
+		if err != nil {
+			return nil, err
+		}
+
+		return []byte(s), nil
+	}
+
+	return toml.Marshal(v)
+}
+
+func (Codec) Decode(b []byte, v interface{}) error {
+	tree, err := toml.LoadBytes(b)
+	if err != nil {
+		return err
+	}
+
+	if m, ok := v.(*map[string]interface{}); ok {
+		vmap := *m
+		tmap := tree.ToMap()
+		for k, v := range tmap {
+			vmap[k] = v
+		}
+
+		return nil
+	}
+
+	return tree.Unmarshal(v)
+}