Refactor names (#31405)

This PR only does "renaming":

* `Route` should be `Router` (and chi router is also called "router")
* `Params` should be `PathParam` (to distingush it from URL query param, and to match `FormString`)
* Use lower case for private functions to avoid exposing or abusing

routers/api/packages/maven/maven.go

@@ -385,7 +385,7 @@ type parameters struct {
 }
 
 func extractPathParameters(ctx *context.Context) (parameters, error) {
-	parts := strings.Split(ctx.Params("*"), "/")
+	parts := strings.Split(ctx.PathParam("*"), "/")
 
 	p := parameters{
 		Filename: parts[len(parts)-1],