Add Swift struct initializers to metadata

Description

For structs, i.e.`MKMapPoint` or `CGPoint`, Apple Help contains initializers, available in Swift only. Example: https://take.ms/zd3Fp

These are so called memberwise initializers.
I.e. For a struct `CGPoint` having `x` and `y` fields, Swift automatically generates a memberwise initializer.

For each of such initializers, we need a mapping added to StructInitializers.def:

Environment

None

Assignee

Alex Petuschak

Reporter

Alex Petuschak

Labels

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Git Branch Name

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GitHub Issue

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Components

Fix versions

Priority

High
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