[tools] Add system package manger with ncurses as example

[uilianries]

Related to conan-io/docs#3974

Documentation PR: conan-io/docs#3978

• Added a new section in tools/ only related to the system namespace.
• As a real example, added ncurses, it's covered natively by CMake and pkgconfig

[memsharded]

It might be better to not have a test_package() for it, but a regular other package recipe that uses it explicitly, so it is visible the if self.settings.os == "Linux": self.requires("ncurses/system") explicitly

[uilianries]

It might be better to not have a test_package() for it, but a regular other package recipe that uses it explicitly, so it is visible the if self.settings.os == "Linux": self.requires("ncurses/system") explicitly

Addressed on the commit 3874e44

Removed the test package, but added a "consumer" application instead. Also, adapted the CI strip to not only build both packages but also find and execute the new application.

[uilianries]

The script test will run only for Linux because we need a system package manager for this example.

[memsharded]

Almost there, looking good

[memsharded]

Great!

[uilianries]

Add extra support for Mac (homebrew) and FreeBSD (pkg):

• https://www.freshports.org/devel/ncurses/
• https://formulae.brew.sh/formula/ncurses

[uilianries]

The commit simplified the consumer example: It shows a colored message on the screen, with ncurses version, then, exits:

[memsharded]

Great, good job!

[uilianries]

@memsharded @czoido I just skipped the example app execution on the commit e3607c1

As we are using ncurses, it will need a configured terminal, which is not the case in the current CI that's building the examples. We could handle terminfo as workaround, but sounds too much. Locally, we should not have this problem when running the application.