solr api v2 manager

[wickedOne]

following #753 (comment) i wrote a solr api v2 manager which i'm willing to share.

it's nothing fancy, a manager class with a couple of interfaces easing the usage of the various solr v2 api endpoints.
i personally use it for both the schema and config api for which i can provide the definitions as well.

do you think that would be a useful contribution?

[mkalkbrenner]

Sure!

[thomascorthals]

Someone at Solr generated Python bindings from OpenAPI spec for the v2 API.

I recently raised an issue about an error in PHPS output and the possibility of generating a PHP library came up. Would that be something we could integrate for the v2 API?