Add feature skip execution of native-maven-plugin mojos

[buzz3791]

Please add the ability to skip execution of the native-maven-plugin mojos.

Many maven plugins support skipping execution.
Examples:
maven-nar:
http://maven-nar.github.io/nar-compile-mojo.html#skip
maven-surefire-plugin:
http://maven.apache.org/plugins-archives/maven-surefire-plugin-2.12.4/examples/skipping-test.html
maven-compiler-plugin:
https://maven.apache.org/plugins/maven-compiler-plugin/compile-mojo.html#skipMain
xml-maven-plugin:
mojohaus/xml-maven-plugin#2

Use case:
Multi-module maven project with hundreds of Java and dozens of C/C++ child modules. Our project takes 20 minutes to build; almost 10 minutes are from the C/C++ modules. Most developers are only making changes to the hundreds of Java projects and would get back a significant amount of time if the C/C++ modules could be optionally skipped.

[ctubbsii]

I suggest naming the user property native.skip and the configuration property (for the POM) skip.