Nested Json Data access

[Blackbaud-BrandonJones]

We allow users to create nested json structures in their stache data files. Our service gave no way of retrieving those nested data values from the methods provided. This change allows users to pass in a string of nested json data to retrieve the value, or a new method for accessing these values from an array.

stache.jsonData.global.nested.list.3.name for example.

[codecov-io]

Codecov Report

Merging #570 into master will not change coverage.
The diff coverage is 100%.

@@          Coverage Diff          @@
##           master   #570   +/-   ##
=====================================
  Coverage     100%   100%           
=====================================
  Files          88     88           
  Lines        1432   1443   +11     
  Branches      172    174    +2     
=====================================
+ Hits         1432   1443   +11

Impacted Files	Coverage Δ
...app/public/src/modules/shared/json-data.service.ts	100% <100%> (ø)	⬆️

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