updated 'import/random_stream' to generate variable length utf8 string and signed/unsigned floats under nested key
updated 'import/random_stream' to generate variable length utf8 string and signed/unsigned floats under nested key

deepglint/streamtools,nytlabs/streamtools,nytlabs/streamtools,nytlabs/streamtools,jacqui/streamtools,deepglint/streamtools,nytlabs/streamtools,wxdublin/streamtools,jacqui/streamtools,wxdublin/streamtools,deepglint/streamtools,pfig/streamtools,jacqui/streamtools,wxdublin/streamtools,pfig/streamtools,deepglint/streamtools,pfig/streamtools,wxdublin/streamtools,pfig/streamtools,jacqui/streamtools