Add user defined function call support for MSSQL

[MMagueta]

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Proposed Changes

WIP

Types of changes

• [ ] Bugfix (non-breaking change which fixes an issue)
• [X] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to not work as expected)

Checklist

• [ ] Build and tests pass locally
• [ ] I have added tests that prove my fix is effective or that my feature works (if appropriate)
• [ ] I have added necessary documentation (if appropriate)

Further comments

WIP

[MMagueta]

Status:

• [X] Parse the XML for a scalar function and inline table functions
• [X] Add callable reference on F#
• [ ] Check parameters for inlined tables and other not so primitive types, such as XML
• [ ] Tests

[MMagueta]

@JordanMarr I am facing a problem that you might have a field view wider than I do. XML fields are simply not being translated to XElement. A procedure/function/UDDT that has an XML type exposed simply does not get designed, not resulting in an overall failure, the rest continues to work just fine. I did confirm that System.Xml.Linq.XElement is on the map for the TSQL correspondence. Any ideas of how to assess this?

[JordanMarr]

Is this question related to the SSDT parser? If so, it might be helpful if you added the sqlproj to the test sln with a broken test to highlight the issue.