Feature request: Align trailing comments across consecutive lines

[YuanTu-8]

Description

It would be great to have an option to align trailing comments on consecutive lines to the same column, similar to clang-format's AlignTrailingComments.

Currently, dprint normalizes trailing comments to a single space after the code, which breaks intentional alignment:

Before formatting (desired output)

let diffZero = 0;  // mismatch count against "010101..."
let diffOne = 0;   // mismatch count against "101010..."

After formatting (current behavior)

let diffZero = 0; // mismatch count against "010101..."
let diffOne = 0; // mismatch count against "101010..."

Proposed behavior

When consecutive lines each have a trailing comment, align them to the same column. A minimum spacing (e.g., 2 spaces) should be maintained between the code and the comment.

A possible configuration might look like:

{
  "typescript": {
    "alignTrailingComments": true,         // default: false
    "alignTrailingComments.minSpaces": 2   // minimum gap before comment
  }
}

Prior art

• clang-format has AlignTrailingComments with Kind: Always | Leave | Never and OverEmptyLines to control how many empty lines still count as "consecutive".
• ReSharper / Rider (C#) supports aligning trailing comments as well.

This feature is common in C/C++ formatters and would be a welcome addition for TypeScript/JavaScript, especially for code with parallel declarations or flag variables where aligned comments greatly improve readability.

Workaround

Currently using // dprint-ignore to preserve manually aligned comments, which works but requires opting out of formatting for those blocks entirely.