Convert NewProvider/NewMutatorProvider to generic providers API

Convert all of the callers to NewProvider and NewMutatorProvider
to use a generic type parameter instead of an example object.

Bug: 316410648
Test: builds
Change-Id: Ic9cdafc87336e26730d3fd596df05de0e7267542
diff --git a/java/classpath_fragment.go b/java/classpath_fragment.go
index bc9de50..eecaebd 100644
--- a/java/classpath_fragment.go
+++ b/java/classpath_fragment.go
@@ -211,7 +211,7 @@
 	}}
 }
 
-var ClasspathFragmentProtoContentInfoProvider = blueprint.NewProvider(ClasspathFragmentProtoContentInfo{})
+var ClasspathFragmentProtoContentInfoProvider = blueprint.NewProvider[ClasspathFragmentProtoContentInfo]()
 
 type ClasspathFragmentProtoContentInfo struct {
 	// Whether the classpaths.proto config is generated for the fragment.