Add support for influxdb.to to the 1.x line

The 1.x line does not implement the `influxdb.to()` function as it is different from the 2.x line.

Clients using Flux inside the 1.x line need the ability to use `influxdb.to()` in order to downsample data using Flux.

Start by locating the 1.x Flux implementation and comparing its handling of influxdb.to() with the 2.x line. The work is done when 1.x clients can use influxdb.to() for Flux-based downsampling, with coverage for that behavior.

Written by the indexing model from the issue text.