MN Sediment - Add MN DRN streamflow selection

[amedenblik]

Parent issue is #1544

Related to #1919-- this issue will add another method by with to retrieve streamflow data

• [ ] Edit the Sediment Model modal to allow the user to select an MN DNR gage and use its streamflow
  • [ ] By map selection: if possible, it would be great to be able to add MN DNR gages to the map temporarily and allow the user to select a gage
  • [ ] Selecting gages from a table would also work
• We are not actually sure if this is possible; it depends on the MN DNR API options
• [ ] Make sure we can continue through the full workflow to send MN DNR streamflow to the SedStats services, which may require some data reformatting
• [ ] Edit the "Streamflow Source" table in the final report to include gage information for MN DNR gages