fix(projection): nested value retrieval with jsonpath selectors #81
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What this PR does / why we need it:
This PR adds support for nested value retrieval with slice/array traversal via JSONPath index selector.
Generally adds JSONPath selector support for projections but remains the restriction of a single projection resulting in a primitive value. Collection type results are not supported.
Which issue(s) this PR fixes:
Fixes #43
Special notes for your reviewer:
In case we want to support collection types as a result of a single projection result, I suggest we create a follow-up feature issue where we align how that should look like.
Release note: