Move the implementation of array formatter to source file to reduce c… (#572)

* Move the implementation of array formatter to source file to reduce compilation time

* [pre-commit.ci] auto fixes from pre-commit.com hooks

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---------

Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>

Author: JohanMabille

include/sparrow/array.hpp

@@ -112,15 +112,10 @@ struct std::formatter<sparrow::array>
         return ctx.begin();  // Simple implementation
     }
 
-    auto format(const sparrow::array& ar, std::format_context& ctx) const
-    {
-        return ar.visit(
-            [&ctx](const auto& layout)
-            {
-                return std::format_to(ctx.out(), "{}", layout);
-            }
-        );
-    }
+    using iterator = std::format_context::iterator;
+
+    SPARROW_API
+    iterator format(const sparrow::array& ar, std::format_context& ctx) const;
 };
 
 namespace sparrow

src/array.cpp

@@ -154,3 +154,14 @@ namespace sparrow
         );
     }
 }
+#if defined(__cpp_lib_format)
+auto std::formatter<sparrow::array>::format(const sparrow::array& ar, std::format_context& ctx) const -> iterator
+{
+    return ar.visit(
+        [&ctx](const auto& layout)
+        {
+            return std::format_to(ctx.out(), "{}", layout);
+        }
+    );
+}
+#endif