perf: incremental rebuild (--fastRebuild v2 but default) (#1841)

* checkpoint

* incremental all the things

* properly splice changes array

* smol doc update

* update docs

* make fancy logger dumb in ci

quartz/util/path.ts

@@ -260,7 +260,7 @@ export function endsWith(s: string, suffix: string): boolean {
   return s === suffix || s.endsWith("/" + suffix)
 }
 
-function trimSuffix(s: string, suffix: string): string {
+export function trimSuffix(s: string, suffix: string): string {
   if (endsWith(s, suffix)) {
     s = s.slice(0, -suffix.length)
   }