Use std::string/string_view versions of starts_with/ends_with where appropriate

The util:: versions of these methods remain as a thin wrapper around them so
they can be used with const char* arguments. Otherwise callers have to manually
make string_view objects from the input.
s Please enter the commit message for your changes. Lines starting

NEWS

@@ -348,12 +348,17 @@ Deprecated Functionality
   tuples. The ConnTuple struct, used by this deprecated Connection constructor,
   is now deprecated as well.
 
+
 - The ``zeek::filesystem`` namespace alias is deprecated in favor of using
   ``std::filesystem`` directly. Similarly, the ``ghc::filesystem`` submodule stored in
   ``auxil/filessytem`` has been removed and the files included from it in the Zeek
   installation will no longer be installed. Builds won't warn about the deprecation of
   ``zeek::filesystem`` due to limitations of how we can mark deprecations in C++.
 
+- The ``zeek::util::starts_with`` and ``zeek::util::ends_with`` functions are deprecated.
+  ``std::string`` and ``std::string_view`` added ``begins_with`` and ``ends_with`` methods
+  in C++ 20, and those should be used instead.
+
 Zeek 7.2.0
 ==========