fix: Stricter schema definitions for histosys and normsys

[kratsg]

Pull Request Description

Resolves #1387. Histosys and Normsys should be stricter about not allowing additional properties in the data object in the schema.

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• Tests are passing
• "WIP" removed from the title of the pull request
• Selected an Assignee for the PR to be responsible for the log summary

Before Merging

For the PR Assignees:

• Summarize commit messages into a comprehensive review of the PR

* Teach the schema to not allow additional properties for histosys and normsys
* Be more explicit about the patchset/jsonpatch metadata information (that we do allow additionalProperties)
* Add tests to check that additionalProperties for for histosys and normsys result in an invalid spec

[matthewfeickert]

LGTM. Thanks @kratsg.

[codecov]

Codecov Report

Merging #1388 (2d51555) into master (9e30e6e) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #1388   +/-   ##
=======================================
  Coverage   97.53%   97.53%           
=======================================
  Files          63       63           
  Lines        3808     3808           
  Branches      538      538           
=======================================
  Hits         3714     3714           
  Misses         55       55           
  Partials       39       39           

Flag	Coverage Δ
contrib	24.18% <ø> (ø)
unittests	97.53% <ø> (ø)

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