Allow sparse_vectors to be passed to collections.create

[AliOsm]

This PR supports sparse vectors in Qdrant:
https://qdrant.tech/documentation/concepts/vectors/#sparse-vectors

Tested on one of my projects and it is working as expected, sample:

Qdrant::Client.new(url: 'http://localhost:6333').collections.create(
  collection_name: 'test',
  vectors: {},
  sparse_vectors: {
    'qdrant--bm25': {
      modifier: :idf
    }
  }
)