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/cmake/dependencies.cmake

@@ -0,0 +1,25 @@
+
+
+include(FetchContent)
+
+## Restbed
+FetchContent_Declare(
+        restbed
+        GIT_REPOSITORY https://github.com/Corvusoft/restbed
+        GIT_TAG        4.7
+)
+
+set(BUILD_TESTS OFF CACHE BOOL "Disable internal restbed tests")
+set(BUILD_SSL OFF CACHE BOOL "Disable SSL")
+FetchContent_MakeAvailable(restbed)
+
+FetchContent_GetProperties(restbed)
+if(NOT restbed_POPULATED)
+
+    FetchContent_Populate(restbed)
+    add_subdirectory(${restbed_SOURCE_DIR} ${restbed_BINARY_DIR})
+endif()
+
+
+## Boost
+find_package(Boost 1.7.0 COMPONENTS system unit_test_framework REQUIRED)