Auto merge of #15879 - dfireBird:fix-14656, r=Veykril

Implement completion for the callable fields.

Fixes #14656

PR is opened with basic changes. It could be improved by having a new `SymbolKind` for the callable fields and implementing a separate render function similar to the `render_method` for the new `SymbolKind`.
It could also be done without any changes to the `SymbolKind` of course, have the new function called based on the type of field.
I prefer the former method.

Please give any thoughts or changes you think is appropriate for this method. I could start working on that in this same PR.
tree: 398de0148629fa0ace494cbd056e2452bb30e5fc
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