[!!!][TASK] Use solarium as http client

[timohund]

In #2067 we use the php solarium api, where we can to build queries with solarium.

The next step is to use the solarium api to perform the http requests to the solr server. Then we can drop the old SolrPhpClient code.

This pr:

• Uses the solarium client where possible to perform requests to the solr server.
• In the case where it is not possible, because this feature is not yet supported in solarium, we peform the http requests with the Adapters that are shipped with solarium. By default we use guzzle, since this is also shipped with TYPO3 and the preferred way
• The parts in the code that previously return and \Apache_Solr_Response now return a \ApacheSolrForTypo3\Solr\System\Solr\ResponseAdapter this response adapter behaves like the previous \Apache_Solr_Response, to keep the code more backwards compatible. In a later step we could make the new Solarium domain objects available with that adapter to allow a step-by-step refactoring

What is missing:

• By now we do not use the domain objects (Result, Facet, ...) from solarium since this would require more breaking changes evenen in the templates. But in the future we plan to use as much as possible from the solarium api to have a bigger benefit from the ongoing deveopment of solarium.