[feature] Support visual studio backend for meson

Reading the docs https://docs.conan.io/en/latest/reference/build_helpers/meson.html

It would seem conan assumes that meson will always use ninja as the build backend. However meson allows you to build using msvc through the flan --backend.

This means that the following meson command:

meson setup build_vs --backend=vs2019 -Dpkg_config_path=build_vs

Cannot be assembled from the conan.py script.

If you try something like this:

        args = [f'-Dpkg_config_path={os.path.abspath("../" + str(self.folders.generators))}']
        if self.settings.compiler == "gcc":
            self.output.error("gcc")
            args += ["-Db_sanitize=undefined", "-Dcpp_std=c++20"]
        if self.settings.compiler == "Visual Studio":
            self.output.error("VS")
            args += ["--backend=vs2019", "-Dcpp_std=c++20"]

        meson = Meson(self)
        meson.configure(build_folder='.', args=args)
        meson.build(args=['-j2'])

You will get this error:

ERROR: conanfile.py: Error in build() method, line 123
        meson.build(args=['-j2'])
        ConanException: Error 1 while executing ninja -C "C:\Users\Makogan\Documents\neverengine\build_visual_studio_debug\." -j2 

• [ x ] I’ve read the CONTRIBUTING guide.

[Makogan]

I made a pull request, the change is so small this should not break compatibility, it handles a strict superset of cases:

https://github.com/conan-io/conan/pull/10447

[memsharded]

@franramirez688

I have wanted to do a conan new --template=meson_lib for a while, to help with this. Would it make sense to try to contribute this asap?