Using dprint to spreedup prettier

[viceice]

• dprint runs processing in parallel, so it would be faster on local dev machine (depends on number of cores and io)
• for github CI it's only a little faster (only 2 cores), but we can speedup alot by using caching to only check changed files since last run
• full prettier run needs ~35s on CI, so this can probably reduced to nearly zero
• currently our full lint job requires ~4min, our test jobs ~10min, so worth checking out?

https://david.deno.dev/posts/faster-prettier-with-dprint/

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