Delta does not allow UpdatableProperties to be changed

[dxrdxr]

Issues

This pull request fixes #2478

Description

Adds a new settable property UpdatableProperties that allows the developer to change the list of updatable properties (_updatableProperties) after construction. This enables the developer to easily control which properties are updated in Patch and Put to prevent the caller from over-posting.

Checklist (Uncheck if it is not completed)

• [ x] Test cases added
• [ x] Build and test with one-click build and test script passed

Additional work necessary

Docs Needed:

• Update the documentation pages to include the new property.

[marabooy]

@xuzhg, @habbes, @KenitoInc, @gathogojr Could you give this another review?

[gathogojr]

LGTM

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This PR has 209 quantified lines of changes. In general, a change size of upto 200 lines is ideal for the best PR experience!

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Label      : Large
Size       : +159 -50
Percentile : 60.9%

Total files changed: 7

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.cs : +156 -50
.bsl : +3 -0

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[gathogojr]

@dxrdxr Any particular reason you opted to substitute var with specific types in the tests? It ended up increasing the diff unnecessarily. The additional tests are welcome, however, having as few changes to the existing tests as possible would have served as a validation that the changes to Delta<TStructuralType> class didn't materially change how the feature works .

[dxrdxr]

@gathogojr I was getting warnings in VS about the code style, which is inconsistent within the file. So I normalized it for consistency and code hygiene.

The project really should have a .editorconfig in the root of the directory tree to enforce a common code style.