feat: unifood base with GET dishes (#1)

Features:
- CLI structure with verbs and resources
- Application config and parameters
- Output formatters
- Initial resource: dishes

Reviewed-on: #1
Co-authored-by: bdoerfchen <git@bissendorf.co>
Co-committed-by: bdoerfchen <git@bissendorf.co>

util/slices.go

@@ -0,0 +1,33 @@
+package util
+
+func Transform[Tin any, Tout any](s []Tin, transformFn func(i *Tin) Tout) (out []Tout) {
+	out = make([]Tout, 0)
+
+	for _, item := range s {
+		out = append(out, transformFn(&item))
+	}
+
+	return
+}
+
+func Select[T any](s []T, selectFn func(i *T) bool) (out []T) {
+	out = make([]T, 0)
+
+	for _, item := range s {
+		if selectFn(&item) {
+			out = append(out, item)
+		}
+	}
+
+	return
+}
+
+func Map[T any, Tkey comparable, Tval any](s []T, transformFn func(i *T) (Tkey, Tval)) (out map[Tkey]Tval) {
+	out = make(map[Tkey]Tval)
+	for _, i := range s {
+		key, val := transformFn(&i)
+		out[key] = val
+	}
+
+	return
+}