GetBlsSeries retrieves BLS-only series not available on FRED (CES, LAUMT, CIU).
BLS series ID (e.g. "CES0500000001", "CIU1010000000000A").
Maximum number of observations to return. Defaults to 60.
Successful response
GetBlsSeriesResponse contains the requested BLS series data.
BlsSeries is a BLS time series with metadata and observations.