split: sync-client utils and errors reorganization

Move error classes from services/ and file-operations/ into a new errors/
directory (authentication-error, server-version-mismatch-error,
sync-reset-error, file-not-found-error), plus add file-already-exists-error
and http-client-error. Update consts.ts and utils/* (await-all,
create-client-id, hash, rate-limit, find-matching-file). Replace
data-structures (locks, min-covered, event-listeners, fix-sized-cache) and
add debugging utilities (in-memory-file-system, log-to-console,
slow-web-socket-factory). Removes utils/create-promise.ts.

frontend/sync-client/src/utils/await-all.ts

@@ -9,7 +9,7 @@ type ResolvedTuple<T extends readonly unknown[]> = {
 export const awaitAll = async <T extends readonly unknown[]>(
     promises: PromiseTuple<T>
 ): Promise<ResolvedTuple<T>> => {
-    // eslint-disable-next-line no-restricted-properties
+    // eslint-disable-next-line no-restricted-properties, @typescript-eslint/await-thenable
     const result = await Promise.allSettled(promises);
     for (const res of result) {
         if (res.status === "rejected") {