Attempt to improve reliability

[samayala22]

Related to swiftly-solution/swiftlys2#325

not too familiar with the codebase but this is the furthest I could go based on the logs, dumps and messages with Skuzzi on discord.

• try to mitigate risky native hook during disconnect teardown
• use concurrent dict for subscribed inventories to prevent data races when syncing
• prevent DB sync to happen with a stale inventory pointer (tentative fix to a problem observed in cases where the stale pointer window is large like cross region DB round-trip of 100ms+)
• use int with CAS to guard from multiple db syncs that can arise from multiple players joining
• use concurrent dict for music kit service, like the rest of the services

Maybe beta branch should be updated from main before considering merging this PR ?

[samayala22]

Closing because it's still crashing. Will be working on my fork instead.