Convert from jsoncpp to nlohmann/json

[Copilot]

Conversion Plan: jsoncpp to nlohmann/json

• Update CMakeLists.txt to use nlohmann_json instead of jsoncpp
• Remove obsolete FindJsonCppCustom.cmake file
• Remove jsoncpp references from samples CMake files
• Remove COPY CMake commands from Dockerfiles
• Update TgTypeParser.h header to use nlohmann/json
• Convert TgTypeParser.cpp implementation to use nlohmann/json API
• Update Api.cpp to use nlohmann/json
• Update TgWebhookServer.h to use nlohmann/json
• Update README.md documentation
• Update Dockerfiles to use nlohmann-json3-dev
• Fix JsonWrapper null checking (use is_null() instead of empty())
• Fix getWebhookInfo parsing bug (parse whole response, not just URL field)
• Test the build with new dependency
• Run existing tests to ensure functionality (all 14 tests pass)
• Address code review feedback

Original prompt

Convert source code to use nlohmann json instead of jsoncpp

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[Royna2544]

@copilot remove old findjsoncppcustom and clear its finding logic to fix that ci error

[Copilot]

@copilot remove old findjsoncppcustom and clear its finding logic to fix that ci error

Removed the obsolete CMake/FindJsonCppCustom.cmake file in commit 9518576. The build now uses nlohmann_json's native CMake package configuration instead of the custom finder logic.

[Royna2544]

@copilot obviously remove the entry on cmakelists.txt

[Royna2544]

fix the workflow error, remove cmake copying

[Copilot]

@copilot obviously remove the entry on cmakelists.txt

Removed all remaining jsoncpp references from CMake files in commit 418cee7. Updated samples/common_defs.cmake and samples/echobot-submodule/CMakeLists.txt to use nlohmann_json::nlohmann_json instead of JsonCpp::JsonCpp and removed the FindJsonCppCustom.cmake include.

[Royna2544]

Remove COPY Cmake Cmake from dockerfiles @copilot

[Copilot]

Remove COPY Cmake Cmake from dockerfiles @copilot

Removed COPY CMake CMake from both Dockerfile and Dockerfile_test in commit 29c9883.

fix the workflow error, remove cmake copying

Removed COPY CMake CMake commands from both Dockerfiles in commit 29c9883. The CMake directory no longer exists after removing FindJsonCppCustom.cmake.