Make it available for find_package()

[Pichas]

For now when you run cmake --target install it copies only headers and lib files, but fails if you try to use find_package(sqlite3mc)

This PR adds cmake code to generate sqlite3mcConfig.cmake, sqlite3mcConfigVersion.cmake, sqlite3mcTargets.cmake. So now you can compile and install it into linux system and use find_package() to compile another projects with this library. All other libraries which uses this lib can be exported and installed without target "sqlite3mc" that is not in any export set error.

This PR was also tested as conan package and git submodule.

Example for static lib. Shared version works too.

# execute in the root folder to compile and install
cmake -D SQLITE3MC_STATIC=ON -Bbuild -S. --fresh
cmake --build ./build --target install

# cmake file for tests
cmake_minimum_required(VERSION 3.20...4.0)

project(my_test)

add_executable(${PROJECT_NAME} main.cpp)

find_package(sqlite3mc_static REQUIRED)
target_link_libraries(${PROJECT_NAME} PRIVATE sqlite3mc_static)

// main.cpp
#include <sqlite3mc/sqlite3mc.h>
#include <stdio.h>

int main() {
  printf("cipher_count: %d\n", sqlite3mc_cipher_count());
  return 0;
}

[Pichas]

fixed typo here

[utelle]

For now when you run cmake --target install it copies only headers and lib files, but fails if you try to use find_package(sqlite3mc)

This PR adds cmake code to generate sqlite3mcConfig.cmake, sqlite3mcConfigVersion.cmake, sqlite3mcTargets.cmake. So now you can compile and install it into linux system and use find_package() to compile another projects with this library. All other libraries which uses this lib can be exported and installed without target "sqlite3mc" that is not in any export set error.

Sounds great. Thank you for your efforts!

This PR was also tested as conan package and git submodule.

Fantastic. This improvement of cmake support will certainly be very welcome by many users of SQLite3MC. I will merge your PR soon.