After moving the time-series write path into its own directory, there is an assortment of time-series functionality spread across timeseries_write_util.cpp & timeseries_write_ops.cpp.

• Expose a public interface from timeseries_write_ops.cpp
• Remove all external dependencies on the bucket catalog & timeseries_write_util in favor of the public write APIs
  • Expose passthrough helpers in the public API for bucket catalog interfaces that are called externally