Feature: Add ability to read .github/FUNDING.yml

[icanhazstring]

Reference: phar-io/phar.io#89

Adding the ability to read the .github/FUNDING.yml beside the manifest.xml it would be possible to display funding information for the user. Since we are hiding the information if the end-user decides to use phive instead of directly installing using tools with composer.

And using the already existing files the maintenance is near to zero for tools that already have the funding enabled.