Include empty arrays for components/inputs/outputs on JSON Serialize

[peterbroadhurst]

Currently (per the included unit test) if you have an empty components array "components": [] on serialization to JSON we remove this array. This make processing the structure downstream more complex.

Sadly Golang doesn't let you omit null, but include the empty array - omitempty zaps both of them (encoding/json/v2 will solve it if it comes along).

So this PR proposes we are more verbose on serialization and always include "components":null rather than when we round-trip an omitted array, and "components":[] when we round-trip an empty array.

This makes components consistent with inputs and outputs.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.64%. Comparing base (1e4fa5d) to head (9ca6e2b).
Report is 37 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #78      +/-   ##
==========================================
+ Coverage   99.62%   99.64%   +0.01%     
==========================================
  Files          39       40       +1     
  Lines        3474     3650     +176     
==========================================
+ Hits         3461     3637     +176     
+ Misses         13       12       -1     
- Partials        0        1       +1     

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[peterbroadhurst]

Decided to close this and work around it in my consuming code... it is a weird behavior, but there's tests in various places that break if you change it - because they expect to be able to round trip omitted components.