Add modulemap files to iOS private frameworks

[leptos-null]

What does this implement/fix? Explain your changes.

Adds .modulemap files to each directory that corresponds with an iOS private framework.

This PR is inspired by the changes in #98 and does not overlap those changes.

Checklist

• [x] New code follows the code rules
• [x] I've added modulemaps for any new libraries (e.g. see libactivator/module.modulemap): it should be possible to @import MyLibrary; in ObjC, or import MyLibrary in Swift.
• [x] My contribution is code written by myself from reverse-engineered headers, licensed into the Public Domain as per LICENSE.md; or, code written by myself / taken from an existing project, released under an OSI-approved license, and I've added relevant licensing credit to LICENSE.md

Does this close any currently open issues?

No

Any relevant logs, error output, etc?

No

Any other comments?

This PR excludes .modulemap files for:

• BiometricKit
• BluetoothManager
• GraphicsServices
• MobileIcons
• SpringBoard
• SpringBoardServices

Each of these directories already contain a header with the name of the default umbrella header.