267 river module rest api update

[caseyli92]

DESCRIPTION OF PR:

• Fix the bug in create datastore layer
• Fix the bug in create style
• Update the river module to use the arcgis_rest_api.py script - tested with the Kaiapoi AOI (selected polygon)

Closes:

• Update the river module to utilize the arcgis_rest_api.py script #267

Developer Checklist

• Make code change
• Update tests
  • Update / create new tests
  • Ensure these tests have the expected behaviour
  • Test locally and ensure tests are passing
• Update documentation
  • Readme
  • Docstrings
  • Comments
  • Wiki

Reviewer Checklist

• Check new code for code smells
• Check new tests
  • Ensure adequate coverage
  • Check for code smells within tests
• Check if documentation needs updating
  • Readme
  • Docstrings
  • Comments
  • Wiki