fix(arcgis-rest-portal): add supported search fields

[dbouwman]

Adds the following fields to the allow list of properties that are copied from ISearchOptions into the request

    "filter",
    "countFields",
    "countSize",
    "categories",
    "categoryFilters",

Also added these to ISearchOptions as optional.

Added tests to ensure these flow through; verified they actually work with the API via linking to another project

[codecov]

Codecov Report

Merging #928 (7db59e7) into master (688d58b) will not change coverage.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##            master      #928   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files          140       140           
  Lines         2406      2406           
  Branches       422       422           
=========================================
  Hits          2406      2406           

Impacted Files	Coverage Δ
...ages/arcgis-rest-portal/src/util/generic-search.ts	100.00% <100.00%> (ø)

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[patrickarlt]

Code LGTM but should we add support for categories, filter and categoryFilter to SearchQueryBuilder?

[dbouwman]

@patrickarlt I took a quick look at SearchQueryBuilder and since that's focus is building the q param, and these are other params are peers to q, I think we'd have to take a different approach... like SearchQueryBuilder's constructor could take a hash of additional props, and then in generic-search we could look for those props and transfer them onto params similar to how ISearchOptions is handled.

Near term we need these other params to be supported on ISearchOptions for some work we are landing in Hub.js. I'm open to input on how to cleanly add these to SearchQueryBuilder as a follow on PR.

[tomwayson]

I've added a follow up issue for SearchQueryBuilder and will port these changes to the v4 branch.