DSLX formatter should reflow multi-line comments as a whole

[mikex-oss]

What's hard to do? (limit 100 words)

When updating a multi-line comment, the formatter only fixes the current line length, moving extra words to a new line, but leaving the rest of the multi-line comment as is. This leaves a bunch of empty white space.

For example:

// XLS (Accelerated HW Synthesis) aims to be the Software Development Kit (SDK) for the End of
// Moore's Law (EoML) era. In this "age of specialization", software and hardware engineers must do
// more co-design across their domain boundaries -- collaborate on shared artifacts, understand each
// other's cost models, and share tooling/methodology. XLS attempts to leverage automation, software
// engineers, and machine cycles to accelerate this overall process.

Update the end of line 2 to "software and hardware engineers and executives must do". Autoformatter spits out:

// XLS (Accelerated HW Synthesis) aims to be the Software Development Kit (SDK) for the End of
// Moore's Law (EoML) era. In this "age of specialization", software and hardware engineers and
// executives must do
// more co-design across their domain boundaries -- collaborate on shared artifacts, understand each
// other's cost models, and share tooling/methodology. XLS attempts to leverage automation, software
// engineers, and machine cycles to accelerate this overall process.

Current best alternative workaround (limit 100 words)

Keep adjusting and reformatting line by line.

Your view of the "best case XLS enhancement" (limit 100 words)

Reflow the entire comment.