Asynchronously encode a list of documents using the Aurelio Platformembedding API. Documents must be strings, sparse encoders do not support other
types.:param docs: The documents to encode.
:type docs: list[str]
:param input_type:
:type semantic_router.encoders.encode_input_type.EncodeInputType
:return: The encoded documents.
:rtype: list[SparseEmbedding]