refactor: move Pkl module definitions to dedicated package

pkg/dwn/gen/Config.pkl.go

@@ -0,0 +1,14 @@
+// Code generated from Pkl module `dwngen`. DO NOT EDIT.
+package gen
+
+type Config struct {
+	Ipfs *IPFS `pkl:"ipfs" json:"ipfs,omitempty"`
+
+	Sonr *Sonr `pkl:"sonr" json:"sonr,omitempty"`
+
+	Motr *Motr `pkl:"motr" json:"motr,omitempty"`
+
+	Schema *Schema `pkl:"schema" json:"schema,omitempty"`
+
+	ProxyUrl string `pkl:"proxyUrl" json:"proxyUrl,omitempty"`
+}