refactor: Add simple clang-tidy readability checks (#6556)

This change enables the following clang-tidy checks:
-  readability-avoid-nested-conditional-operator,
-  readability-avoid-return-with-void-value,
-  readability-braces-around-statements,
-  readability-const-return-type,
-  readability-container-contains,
-  readability-container-size-empty,
-  readability-else-after-return,
-  readability-make-member-function-const,
-  readability-redundant-casting,
-  readability-redundant-inline-specifier,
-  readability-redundant-member-init,
-  readability-redundant-string-init,
-  readability-reference-to-constructed-temporary,
-  readability-static-definition

src/test/jtx/impl/JSONRPCClient.cpp

@@ -35,8 +35,10 @@ class JSONRPCClient : public AbstractClient
                 continue;
             using namespace boost::asio::ip;
             if (pp.ip && pp.ip->is_unspecified())
+            {
                 *pp.ip = pp.ip->is_v6() ? address{address_v6::loopback()}
                                         : address{address_v4::loopback()};
+            }
 
             if (!pp.port)
                 Throw<std::runtime_error>("Use fixConfigPorts with auto ports");