LSP: Support organizeImports #30840
Description
I'm proposing the addition of the organizeImports feature to the Deno Language Server.
A similar request was made in issue #14173. When it was opened, the Deno VS Code extension was conflicting with the editor's built-in "Organize Imports" command (denoland/vscode_deno#644). This conflict was later resolved in denoland/vscode_deno#645, which allowed the native VS Code feature to function again for Deno projects.
After that fix in the VS Code extension, issue #14173 was closed with the comment "seems to be working."
However, the solution was to unblock a VS Code feature, not to implement organizeImports within the Deno LSP itself. As a result, this functionality remains unavailable to users on any editor other than VS Code that relies solely on the LSP.
To provide a consistent experience for all users, this feature should be implemented directly in the Deno LSP. Since tsserver already provides this capability and is used internally, the implementation should be straightforward.