C# 11: Generic attributes

[michaelnebel]

It turns out that the extractor supports generic attributes out of the box due to the existing reference design between attributes and types.
That is, we only need to implement some minor Code QL library functionality for generic attributes to fetch type arguments and the like.
However, as a part of the process @tamasvajk discovered that attributes on methods in CIL was not correctly extracted. With the help of @tamasvajk this is fixed in #11907

[tamasvajk]

@michaelnebel It might be worth checking if the CIL extractor also supports generic attributes. We do some attribute processing in CustomAttributeDecoder.

[michaelnebel]

@michaelnebel It might be worth checking if the CIL extractor also supports generic attributes. We do some attribute processing in CustomAttributeDecoder.

After the changes to make support for attributes on methods, I can confirm that generic attributes also works out of the box for attributes extracted from CIL.
To align a bit more with source code extracted attributes, I have changed the printing of constructed types extracted from CIL.

[tamasvajk]

Let's check with DCA too. Otherwise it looks good to me.

[michaelnebel]

Let's check with DCA too. Otherwise it looks good to me.

👍 Yes definitely! I will take this PR out of draft and rebase as soon as its dependency has been merged and then run DCA!

[michaelnebel]

DCA looks good!
@tamasvajk : Can you re-approve. The only changes since list time is a rebase and a merge of two commits containing the change-note.