Update settings schema to V4 to fix a migration bug in obfuscation settings

[rablador]

We've introduced breaking changes in the current main that necessitate a new settings schema version. We should add a migration and bump the schema version for this. This can currently be verified by installing a main version over 2023.7.

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This change is 

[linear]

IOS-403 Add another settings schema version due to changes in how the obfuscation settings are encoded.

[mojganii]

Reviewable status: 0 of 5 files reviewed, 1 unresolved discussion (waiting on @rablador)

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ios/MullvadSettings/TunnelSettings.swift line 31 at r1 (raw file):

    case v3 = 3

    /// V3 format with support for WireGuard obfuscation options with UInt16 port backing values,

I would suggest to consider more descriptive comments for these sort of schemas .I'm confused when I read them...
V4 supports V3 configuration plus back port abilities for WireGuard obfuscation

[buggmagnet]

!

Reviewed 5 of 5 files at r2, all commit messages.
Reviewable status: all files reviewed, 1 unresolved discussion (waiting on @rablador)

[rablador]

Dismissed @mojganii from a discussion.
Reviewable status: complete! all files reviewed, all discussions resolved

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ios/MullvadSettings/TunnelSettings.swift line 31 at r1 (raw file):

Previously, mojganii wrote…

I would suggest to consider more descriptive comments for these sort of schemas .I'm confused when I read them...
V4 supports V3 configuration plus back port abilities for WireGuard obfuscation

Reverted version changes altogether, so I'm marking this comment as resolved.

[rablador]

After IRL discussion it was decided to go for a smaller change without version bump to tunnel settings.

Reviewable status: 4 of 5 files reviewed, all discussions resolved (waiting on @buggmagnet)