Close #259: Customize gradle-wrapper.properties

[anthonydahanne]

Summary

• add new binding of type gradle-wrapper that allows the user to, for example, override the networkTimeout or distributionUrl.

Use Cases

for example when default timeout is not enough to dwonlaod the gradle distribution zip, of if the user wants to doanlod the distribution zip from a different url than gradle default url.

Checklist

• I have viewed, signed, and submitted the Contributor License Agreement.
• I have linked issue(s) that this PR should close using keywords or the Github UI (See docs)
• I have added an integration test, if necessary.
• I have reviewed the styleguide for guidance on my code quality.
• I'm happy with the commit history on this PR (I have rebased/squashed as needed).

[anthonydahanne]

see how to use in the samples: paketo-buildpacks/samples#585