Allow LOCAL with a custom string

[nplasterer]

iOS side of xmtp/xmtp-android#170

You can call this now with XMTPEnvironment.customLocalAddress = "string"

Gives the ability to run a physical android app pointing at a local environment.

[macroscopeapp]

Add Custom Local Environment Address Support

Added customLocalAddress configuration option to XMTPEnvironment to allow custom local environment URLs. Modified URL generation logic to use custom address when specified. Updated version from 4.0.1 to 4.0.2.

📍Where to Start

The XMTPEnvironment enum in XMTPEnvironment.swift which contains the core environment configuration changes.

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Macroscope summarized d7b536f.

[macroscopeapp]

Changes in 9c0bc74

• Refactored URL construction in XMTPiOS module's XMTPEnvironment enum by separating port numbers (:443 and :5556) from host addresses in raw values and moving port handling to the url property implementation
• Added address computed property to XMTPiOS module's XMTPEnvironment enum to support custom local address overrides

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Macroscope summarized 9c0bc74.