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

src/storage/backend/redis/Redis.cc

@@ -635,7 +635,7 @@ void Redis::HandleInfoResult(redisReply* reply) {
                 continue;
 
             // We only care about the redis_version entry. Skip anything else.
-            if ( ! util::starts_with(e, "redis_version:") )
+            if ( ! e.starts_with("redis_version:") )
                 continue;
 
             auto splits = util::split(e, ':');