Feature/image number improvements

[noahmanger]

This is just an experiment to tackle a couple unrelated image number feature requests. The first is to add an image number column to the main filings table and the second is to add functionality to the main data search so that entering an image number pulls up a filing.

We still need to figure out if/how we want to do this, but it was an easy thing to test so filing a PR so I don't lose track of the work.

Resolves https://github.com/18F/openFEC-web-app/issues/2055 Resolves https://github.com/18F/openFEC-web-app/issues/2054

[codecov-io]

Codecov Report

Merging #2143 into develop will decrease coverage by 0.73%. The diff coverage is 16.66%.

@@             Coverage Diff             @@
##           develop    #2143      +/-   ##
===========================================
- Coverage    53.84%   53.11%   -0.74%     
===========================================
  Files           52       52              
  Lines         3421     3694     +273     
  Branches       409      445      +36     
===========================================
+ Hits          1842     1962     +120     
- Misses        1548     1700     +152     
- Partials        31       32       +1

Impacted Files	Coverage Δ
openfecwebapp/constants.py	100% <ø> (ø)	:arrow_up:
static/js/modules/columns.js	20.38% <ø> (-1.47%)	:arrow_down:
openfecwebapp/routes.py	46.54% <16.66%> (+1.75%)	:arrow_up:
openfecwebapp/views.py	39.23% <0%> (-0.19%)	:arrow_down:
static/js/legal/LegalSearch.js	83.33% <0%> (+0.23%)	:arrow_up:
static/js/legal/SearchResults.js	34.28% <0%> (+2.14%)	:arrow_up:
openfecwebapp/api_caller.py	64.25% <0%> (+8.57%)	:arrow_up:

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[LindsayYoung]

is there a companion pr that implements the search?

[LindsayYoung]

Thanks!