Revert "chore: remove unnecessary CryptoHandlerModule"

This is used in #2170 so let's avoid the unnecessary conflict.

This reverts commit f5bf450.

Author: msfjarvis

app/src/main/java/app/passwordstore/injection/crypto/CryptoHandlerModule.kt

@@ -0,0 +1,18 @@
+/*
+ * Copyright © 2014-2021 The Android Password Store Authors. All Rights Reserved.
+ * SPDX-License-Identifier: GPL-3.0-only
+ */
+
+package app.passwordstore.injection.crypto
+
+import app.passwordstore.crypto.PGPainlessCryptoHandler
+import dagger.Module
+import dagger.Provides
+import dagger.hilt.InstallIn
+import dagger.hilt.components.SingletonComponent
+
+@Module
+@InstallIn(SingletonComponent::class)
+object CryptoHandlerModule {
+  @Provides fun providePgpCryptoHandler() = PGPainlessCryptoHandler()
+}