Rename __TunnelKitUtils to TunnelKitUtils

[makoni]

If you'll try to upload an build with TunnelKit inside (via Swift PM) you'll get an error from App Store Connect:

[Transporter Error Output]: ERROR ITMS-90049: This bundle is invalid. The bundle at path Payload/MyApp.app/Frameworks/__TunnelKitUtils.framework has an invalid CFBundleIdentifier '__TunnelKitUtils' There are invalid characters(characters that are not dots, hyphen and alphanumerics) that have been replaced with their code point '\u005f\u005fTunnelKitUtils' CFBundleIdentifier must be present, must contain only alphanumerics, dots, hyphens and must not end with a dot. [see the Core Foundation Keys at https://developer.apple.com/library/content/documentation/General/Reference/InfoPlistKeyReference/Articles/CoreFoundationKeys.html#//apple_ref/doc/uid/TP40009249-102070-TPXREF105]

[keeshux]

Is this something new from Apple? I've never had issues like this and last time I uploaded a build was no more than one month ago.

[makoni]

Not sure if it's something new, saw it for the first time. Used old version of TunnelKit previously via Cocoapods, updated to new version with Swift PM and got that error during uploading

[keeshux]

This is not an issue. Had several builds approved by Apple.