[mongoose] Add new port

[myd7349]

https://github.com/cesanta/mongoose

There is also a Javascript project named mongoose: https://github.com/Automattic/mongoose
From https://repology.org/projects/?search=mongoose, we see that some use mongoose as the lib name, and some use libmongoose.

Cesanta also provides a web server application named mongoose which can be downloaded from the homepage.

[ras0219-msft]

Thanks for the PR and the name research 👍 !

Since we always have 3.14 available, we can start taking advantage of new awesome defaults in cmake such as the default install directories[1] which helps to trim out a few lines :).

[1] https://cmake.org/cmake/help/v3.14/command/install.html#targets

[gjasny]

Just a heads-up: there's also civetweb in vcpkg which is a mongoose fork but uses the same symbol names.

[dan-shaw]

/azp run

[dan-shaw]

/azp run

[azure-pipelines]

Azure Pipelines successfully started running 1 pipeline(s).

[dan-shaw]

Thanks for the PR!