Swift support (server-side, CLI usage)

Hi,

There's a growing community around using Swift outside of Apple's ecosystem but there is a severe lack of options for editors/IDEs. Xcode is the main editor but it's also one of the biggest complaints for Swift developers, particularly for those that aren't building applications on Apple platforms (iOS, MacOS, etc). There is a VSCode plugin created by the Swift Server Workgroup (SSWG) which is great but is limited to VSCode. Jetbrains used to have Appcode but that is no longer being developed.

Given Fleet's “Polyglot” branding, it would be amazing if Fleet could support Swift development particularly catering towards non-Apple platform use cases such as building web APIs and CLI applications.

Thanks!