Validate that a recursive complex-typed property must be nullable

[lisicase]

Issues

This pull request addresses #2512.

Description

Validates that if a complex-typed property is recursive, it must also be nullable.

Checklist (Uncheck if it is not completed)

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

Additional work necessary

Adding this validation rule to the base rule set is a breaking change that should be added in a future release.

[pull-request-quantifier-deprecated]

This PR has 123 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      : Medium
Size       : +122 -1
Percentile : 44.6%

Total files changed: 10

Change summary by file extension:
.cs : +115 -1
.txt : +1 -0
.bsl : +6 -0

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