feat: add prefixName to extensions

Author: phnx47

src/Prometheus.Client/Collectors/DotNetStats/CollectorRegistryExtensions.cs

@@ -2,10 +2,10 @@ namespace Prometheus.Client.Collectors.DotNetStats
 {
     public static class CollectorRegistryExtensions
     {
-        public static ICollectorRegistry UseDotNetStats(this ICollectorRegistry registry)
+        public static ICollectorRegistry UseDotNetStats(this ICollectorRegistry registry, string prefixName = "")
         {
-            registry.Add(new GCCollectionCountCollector());
-            registry.Add(new GCTotalMemoryCollector());
+            registry.Add(new GCCollectionCountCollector(prefixName));
+            registry.Add(new GCTotalMemoryCollector(prefixName));
 
             return registry;
         }

src/Prometheus.Client/Collectors/ProcessStats/CollectorRegistryExtensions.cs

@@ -4,9 +4,9 @@ namespace Prometheus.Client.Collectors.ProcessStats
 {
     public static class CollectorRegistryExtensions
     {
-        public static ICollectorRegistry UseProcessStats(this ICollectorRegistry registry)
+        public static ICollectorRegistry UseProcessStats(this ICollectorRegistry registry, string prefixName = "")
         {
-            registry.Add(new ProcessCollector(Process.GetCurrentProcess()));
+            registry.Add(new ProcessCollector(Process.GetCurrentProcess(), prefixName));
 
             return registry;
         }