[WIP] C# 14: Support `extension` blocks.#21220

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michaelnebel wants to merge 14 commits intogithub:mainfrom

michaelnebel:csharp14/extension

Commits on Feb 4, 2026

C#: Add extended_type to the DB scheme.
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C#: Add parameter marker interface, allow a type to a parent for parameter and make it possible to specify a parameter position offset.
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C#: Move some populate methods and location writing methods.
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C#: Add class for making synthetic parameter entities.
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C#: Extract extension types and members. Replacing invocations to static generated methods with invocation of extension type member.
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C#: Add ExtensionType to the QL library.
michaelnebel
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C#: Add extension callable and accessor classes.
michaelnebel
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C#: Add extension call classes.
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C#: Replace extension parameter access with the corresponding synthetic parameter.
michaelnebel
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C#: Add dispatch logic for calling extensions accessors as methods.
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C#: Add extensions test.
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C#: Add PrintAst test for extensions.
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C#: Add extension data flow test.
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C#: Add MaD tests for extensions.
michaelnebel
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