Add config option for playing sound-hints with desktop notifications

[Akselmo]

This patch adds a configuration element called play_sound (bool, false by default) that when set true,
it will tell the notification to use sound hint called message-new-instant which then plays a sound,
depending on the platform the app is running in.

(I haven't really used Rust before so bear with me 😅 )

[Akselmo]

I haven't added docs yet, just testing the waters first.

[VAWVAW]

I think it would make more sense to make the config option a string with the sound name. Some people might want a different sound to play and I'm not certain the default sounds on windows and macos use the same name as linux anyways. We could then list the default sound names for each OS in the documentation.

[Akselmo]

I think it would make more sense to make the config option a string with the sound name. Some people might want a different sound to play and I'm not certain the default sounds on windows and macos use the same name as linux anyways. We could then list the default sound names for each OS in the documentation.

Yeah i can do that instead.

[Akselmo]

Turned it into a String. I don't know if theres some better way to do that though, I have not written much rust.

[VAWVAW]

Looks good. Just some small suggestions according coding style.

[Akselmo]

Will write documentation about it next.

[ulyssa]

This looks good! Thank you @Akselmo for adding this! I'll make sure it gets added to the website when I cut the release.

[VAWVAW]

@ulyssa will you also add it to the man page or should that be a new PR?

[Akselmo]

I'm jotting this down here before I forget as some basic outline for the manual entry:

• Setting uses XDG sound hint names as mentioned in the spec
• Good example value is message-new-instant
• Leaving it empty disables sound

[VAWVAW]

For windows the options are "Default", "IM", "Mail", "Reminder", "SMS" (https://docs.rs/tauri-winrt-notification/0.7.2/src/tauri_winrt_notification/lib.rs.html#118-131) and "Alarm", "Alarm2", ..., "Alarm10", "Call", "Call2", ..., "Call10" (https://docs.rs/tauri-winrt-notification/0.7.2/src/tauri_winrt_notification/lib.rs.html#198-226).

[VAWVAW]

For macos, it seems like the system sounds are located in /System/Library/Sounds (https://developer.apple.com/documentation/usernotifications/unnotificationsound)