feat: implement endian conversion utilities

Author: HeartLinked

src/iceberg/util/endian.h

@@ -27,7 +27,7 @@
 
 namespace iceberg {
 
-/// \brief Concept for values that can be written in little-endian format.
+/// \brief Concept for values that can be converted to/from another endian format.
 template <typename T>
 concept EndianConvertible = std::is_arithmetic_v<T> && !std::same_as<T, bool>;