Add option to query WQP using shapefile upload

[cristinamullin]

Is your feature request related to a problem? Please describe.

See aoi_sf option of TADA_DataRetrieval: https://usepa.github.io/EPATADA/reference/TADA_DataRetrieval.html

Describe the solution you'd like

Add option for users to upload and shapefile to the app and use that to query the WQP using the aoi_sf option of TADA_DataRetrieval.

Reminders for TADA contributors addressing this issue

New features and/or edits should include the following work:

• Create or edit the code.

• Document all code using line/inline and/or multi-line/block comments
  to describe what is does.

• Create or edit tests in tests/testthat folder to help prevent and/or
  troubleshoot potential future issues.

• If your code edits impact other functionality in the shiny
  app, ensure those are updated as well.

• Run styler::style_pkg(), devtools::document(), and devtools::check()
  and address any new notes or issues before creating a pull request.

[JamesBisese]

How about changing the requirement to using a GeoJSON file? It is more robust and will work with any vendors data - including ESRI. I see that this is how EPATADA implemented it, using a shapefile. But ... this is such an ESRI way of doing it.
(I am doing GIS work on another project and using ArcGIS Pro - but I would never use a shapefile anymore. It is really
old technology and imposes all sorts of data restrictions - like 8-character field names.)

aoi_sf
An sf object to use for a query area of interest. If using a local shapefile, sf::read_sf can be used to read in a user provided shapefile. This will only work for polygons.

Better
aoi_geojson
An sf (simple feature) object to use for a query area of interest. If using a local file, sf::st_read can be used to read in a user provided geojson file. This will only work for features with geometry type of Polygon or MultiPolygon. The function 'sf::st_read()' is already available in the sf package (sf stands for simple feature - not shape file)

[cristinamullin]

Hold on this until WQP beta is operational.