Cpp restbed server improvements (#13030)

* Keep old implementation of cpp-restbed generator as cpp-restbed-server-deprecated

* Refactor operation path processing

* Restructure samples directory to better allow writing tests

* Improve templates for cpp-restbed-server

Improve templates

* Add integration tests

* Improvement in templates for cpp-restbed-server

* Fix tests

* Improve cpp-restbed generator

* Improve cpp-restbed-server

* Add more tests

* Add suppoert for arrays of enums in query params

* Generate CMakeLists.txt

* Small improvements and example in Readme

* Add integration tests to maven project

* Update doc

samples/server/petstore/cpp-restbed/build_and_test.sh

@@ -0,0 +1,21 @@
+#!/usr/bin/env bash
+
+set -u
+set -e
+
+SCRIPT_DIR=$( cd -- "$( dirname -- "${BASH_SOURCE[0]}" )" &> /dev/null && pwd )
+
+cd ${SCRIPT_DIR}
+
+rm -rf build
+
+cmake -S . -B build
+cd build
+make
+
+# pure C++ tests
+make test -j4
+
+# tests with Java client
+# run them during development
+#make run_all_java_client_test_for_cpp_server