Simplify Search Request Params

[jbuckner]

Instead of having to instantiate classes for searches, now you can just pass JSON objects in.

[codecov]

Codecov Report

Merging #7 (27a1169) into main (8b465af) will decrease coverage by 4.06%.
The diff coverage is 69.71%.

❗ Current head 27a1169 differs from pull request most recent head 554c5ac. Consider uploading reports for the commit 554c5ac to get more accurate results

@@            Coverage Diff             @@
##             main       #7      +/-   ##
==========================================
- Coverage   79.60%   75.54%   -4.07%     
==========================================
  Files          20       20              
  Lines        1329     1325       -4     
  Branches       32       26       -6     
==========================================
- Hits         1058     1001      -57     
- Misses        269      322      +53     
  Partials        2        2              

Impacted Files	Coverage Δ
src/models/file.ts	58.09% <36.23%> (-36.97%)	⬇️
src/models/review.ts	51.21% <44.11%> (-15.45%)	⬇️
src/search-backend/default-search-backend.ts	89.58% <100.00%> (+1.03%)	⬆️
src/search-param-url-generator.ts	100.00% <100.00%> (ø)
src/search-params.ts

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