Add C support

[omdxp]

Is your feature request related to a problem? Please describe.
A C library for kuliya.

Describe the solution you'd like
A library under c/ folder

TODOs

• Add a build script to prepare kuliya dataset to be consumed from kuliya library #66
• Implement get_node_by_path API #67
• Switch to cmake build system #68
• Use Conan package manager to link jsmn #69
• Publish kuliya library to ConanCenter #70
• generate code docs with Doxygen #72
• Add README.md for C library #75
• Using Check test framework #79
• Using CppUTest unit testing framework #81
• add MIT LICENSE to c library #89
• bundle LICENSE file to release tar #91
• update C README with Conan installation #92

Additional context

• https://github.com/zserge/jsmn
• https://conan.io
• https://docs.conan.io/2.0/tutorial/consuming_packages/build_simple_cmake_project.html
• https://cmake.org
• https://conan.io/center
• https://docs.conan.io/en/1.17/uploading_packages/bintray/conan_center_guide.html
• https://www.doxygen.nl
• https://github.com/libcheck/check
• https://github.com/cpputest/cpputest