Using Maven Wrapper for build

[Volkan Yazıcı]

Hello,

Currently the JMH build requires the host system to have Maven installed.
Using a script-only[1] Maven Wrapper <https://maven.apache.org/wrapper/>,
this requirement can be removed and JMH can provide whatever Maven version
it needs out-of-the-box. In short, one less requirement for users who want
to build the sources.

If maintainers agree, I can submit a PR for this change.

Kind regards.

[1] A script-only Maven Wrapper is composed of two script files (`/mvnw`
for Linux and macOS, `mvnw.bat` for Windows) and a configuration file
(`.mvn/wrapper/maven-wrapper.properties`). All files are licensed with
Apache License, Version 2.0.
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