Lat/Lng inputs to all v2 API requests made optional.

[davphan]

Resolves #3298

Lat and lng inputs were required for most of the API requests. Now Lat/lng inputs are optional and if left empty will autofill with the edge boundaries for the designated city. Only changed in the v2 API requests.

Before/After screenshots (if applicable)

Before:

After:

Testing instructions

1. Test each of the following APIs:

• /v2/access/attributes
• /v2/access/attributesWithLabels
• /v2/access/score/streets
• /v2/access/score/neighborhoods
  Can be tested with combinations of different missing/defined lat/lng, and other optional parameters (i.e. filetype)
   

Things to check before submitting the PR

• I've written a descriptive PR title.
• I've added/updated comments for large or confusing blocks of code.
• I've included before/after screenshots above.

[misaugstad]

Looks good! The text on the API wasn't updated and should have been (the params are still listed as required instead of optional), but we can fix that in your other PR to simplify things a bit.