feat: add LSItemContentTypes and CFBundleTypeIconFile support for fileAssociations on macOS

[kingsword09]

According to apple docs:

1. LSItemContentTypes: CFBundleTypeExtensions has been deprecated since OS X v10.5, so LSItemContentTypes has been added. In macOS 10.5 and later, this key (when present) takes precedence over these type-identifier keys: CFBundleTypeExtensions, CFBundleTypeMIMETypes, CFBundleTypeOSTypes.
2. CFBundleTypeIconFile: this key contains a string with the name of the icon file (.icns) to associate with this macOS document type. [feat] Support set fileAssociations icon #13302
3. To avoid breaking changes, the attribute is set as optional.

[FabianLars]

Thanks for the PR! I think we need to think a tiny bit more about the icon support. We may wanna think about letting users specify the file path to the icns file on the dev system and copy it ourselves to where it's needed (iirc that's what we do for other icons/images) or alternatively check if bundling the icns file as a resource works and document that.
We probably should keep in mind that iOS' CFBundleTypeIconFiles works differently (multiple pngs instead of one icns) for that decision even if we don't support file assocs on ios yet.

[github-actions]

Package Changes Through 40142ef

There are 6 changes which include tauri with minor, tauri-bundler with minor, tauri-utils with minor, tauri-cli with minor, @tauri-apps/cli with minor, @tauri-apps/api with minor

Planned Package Versions

The following package releases are the planned based on the context of changes in this pull request.

package	current	next
@tauri-apps/api	2.5.0	2.6.0
tauri-utils	2.4.0	2.5.0
tauri-bundler	2.4.0	2.5.0
tauri-runtime	2.6.0	2.6.1
tauri-runtime-wry	2.6.0	2.6.1
tauri-codegen	2.2.0	2.2.1
tauri-macros	2.2.0	2.2.1
tauri-plugin	2.2.0	2.2.1
tauri-build	2.2.0	2.2.1
tauri	2.5.1	2.6.0
@tauri-apps/cli	2.5.0	2.6.0
tauri-cli	2.5.0	2.6.0

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