MacOS circular references cause some unexpected exceptions

[qzlong]

Checklist

• I read the troubleshooting guide before raising this issue
• I made sure that the issue I am raising doesn't already exist

Current bug behaviour

In the file SwiftAudioplayersDarwinPlugin.swift, the register method creates an instance of SwiftAudioplayersDarwinPlugin that holds the registrar, and the register method calls registrar.addMethodCallDelegate(instance, channel: methods) to register the instance with the registrar.
Circular references have caused some anomalies. Perhaps it is possible to change the attribute definition from var register: FlutterPluginRegister to weak var register: FlutterPluginRegister?

Expected behaviour

Steps to reproduce

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Code sample

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Affected platforms

iOS, macOS

Platform details

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AudioPlayers Version

main

Build mode

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Audio Files/URLs/Sources

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Screenshots

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Logs

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Related issues / more information

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Working on PR

no way

[Gustl22]

Good insight, thanks. Perhaps one can look at other platform implementations e.g. video_player and apply the best practice to the darwin implementation. We appreciate any help from the community!