pTraits::read: Moved the read<Type>(Istream&) from read.H to pTraits.H

so that primitives can be read from Istream without the need to include
IStringStream.H

src/OpenFOAM/primitives/pTraits/pTraits.H

@@ -2,7 +2,7 @@
   =========                 |
   \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
    \\    /   O peration     | Website:  https://openfoam.org
-    \\  /    A nd           | Copyright (C) 2011-2018 OpenFOAM Foundation
+    \\  /    A nd           | Copyright (C) 2011-2023 OpenFOAM Foundation
      \\/     M anipulation  |
 -------------------------------------------------------------------------------
 License
@@ -71,6 +71,13 @@ public:
 };
 
 
+template<typename Type>
+inline Type read(Istream& is)
+{
+    return pTraits<Type>(is);
+}
+
+
 // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
 } // End namespace Foam

src/OpenFOAM/primitives/pTraits/read.H

@@ -32,6 +32,7 @@ Description
 #ifndef read_H
 #define read_H
 
+#include "pTraits.H"
 #include "IStringStream.H"
 
 // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
@@ -41,12 +42,6 @@ namespace Foam
 
 // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
-template<typename Type>
-inline Type read(Istream& is)
-{
-    return pTraits<Type>(is);
-}
-
 template<typename Type>
 inline Type read(const string& str)
 {