fixes #83

This PR brings new CMake features intro taoPQ, resulting in a more reliable and reproducible build.

I included a CMakePresets.json with several builds, which should be used by customers who only want to install taoPQ (e.g. unixlike-release), but also a more developer profile (e.g. msvc-debug-dev), which injects warning flag too.

The very same preset is used by the Github workflow as well, so who reports a bug, is able to run the exactly same profile without much effort.

The CI also is now updated, is all using those presets and some old builds, like Debug, are no longer present to accelerate and CI result. For libpq dependency, I added Conan in the CI steps, so we make sure we will always bring the exactly same library when building taoPQ in the CI, right now is locked to 17.5. All builds now are using Ninja as well, the result is a much faster build on Windows.

I also increased the sanitizer profiles used to test taoPQ, so far, all good.

The build for testing has been divided in integration, which requires a PQ instance running, and unit, which only does internal checks without a DB. I may help in case users are not able to run a DB but want to validate some part of the code. By default, is all enabled.

I also added an example folder, with the very basic getting started. At least, people will have a north how to consume taoPQ without reading the docs only.

The main CMakeList.txt has been reformulated as well, it uses PostgreSQL::PostgreSQL CMake target, the recommendation for CMake 3+. And the taopqConfig.cmake is now generated on the fly, no longer need a template as before.