[core] Remove Latch since it's not needed anymore

mirai-core-utils/src/commonMain/kotlin/sync/Latch.kt

@@ -1,53 +0,0 @@
-/*
- * Copyright 2019-2023 Mamoe Technologies and contributors.
- *
- * 此源代码的使用受 GNU AFFERO GENERAL PUBLIC LICENSE version 3 许可证的约束, 可以在以下链接找到该许可证.
- * Use of this source code is governed by the GNU AGPLv3 license that can be found through the following link.
- *
- * https://github.com/mamoe/mirai/blob/dev/LICENSE
- */
-
-package net.mamoe.mirai.utils.sync
-
-import kotlinx.coroutines.CompletableDeferred
-import kotlinx.coroutines.Job
-import kotlinx.coroutines.completeWith
-import kotlin.coroutines.CoroutineContext
-import kotlin.coroutines.EmptyCoroutineContext
-
-
-public interface Latch<T> {
-    /**
-     * Suspends and waits to acquire the latch.
-     * @throws Throwable if [resumeWith] is called with [Result.Failure]
-     */
-    public suspend fun acquire(): T
-
-    /**
-     * Release the latch, resuming the coroutines waiting for the latch.
-     *
-     * This function will return immediately unless a client is calling [acquire] concurrently.
-     */
-    public fun resumeWith(result: Result<T>)
-}
-
-
-public fun <T> Latch(parentCoroutineContext: CoroutineContext = EmptyCoroutineContext): Latch<T> =
-    LatchImpl(parentCoroutineContext)
-
-private class LatchImpl<T>(
-    parentCoroutineContext: CoroutineContext
-) : Latch<T> {
-    private val deferred: CompletableDeferred<T> = CompletableDeferred(parentCoroutineContext[Job])
-
-
-    override suspend fun acquire(): T = deferred.await()
-
-    override fun resumeWith(result: Result<T>) {
-        if (!deferred.completeWith(result)) {
-            error("$this was already resumed")
-        }
-    }
-
-    override fun toString(): String = "LatchImpl($deferred)"
-}