Functions: add float2 cpp type

This also adds a hash function for `float2`, because `CPPType`
expects that currently.

source/blender/blenlib/BLI_float2.hh

@@ -80,6 +80,13 @@ struct float2 {
     return *this;
   }
 
+  uint64_t hash() const
+  {
+    uint64_t x1 = *reinterpret_cast<const uint32_t *>(&x);
+    uint64_t x2 = *reinterpret_cast<const uint32_t *>(&y);
+    return (x1 * 812519) ^ (x2 * 707951);
+  }
+
   friend float2 operator+(const float2 &a, const float2 &b)
   {
     return {a.x + b.x, a.y + b.y};

source/blender/functions/intern/cpp_types.cc

@@ -26,6 +26,7 @@ namespace blender::fn {
 MAKE_CPP_TYPE(bool, bool)
 
 MAKE_CPP_TYPE(float, float)
+MAKE_CPP_TYPE(float2, blender::float2)
 MAKE_CPP_TYPE(float3, blender::float3)
 MAKE_CPP_TYPE(float4x4, blender::float4x4)