Schema for creating a new Source.
@type t() :: %LettaAPI.Model.SourceCreate{ description: String.t() | nil, embedding: String.t() | nil, embedding_chunk_size: integer() | nil, embedding_config: LettaAPI.Model.EmbeddingConfig.t() | nil, metadata: %{optional(String.t()) => any()} | nil, name: String.t() }