Add ClientEnterpriseHook and ClientBuilderEnterpriseHook

These allow us to not expose the enterprise internal when setting up custom configs for both `ClientBuilder` and `Client`

libraries/matrix/api/src/main/kotlin/io/element/android/libraries/matrix/api/MatrixClientBuilder.kt

@@ -0,0 +1,13 @@
+/*
+ * Copyright (c) 2026 Element Creations Ltd.
+ *
+ * SPDX-License-Identifier: AGPL-3.0-only OR LicenseRef-Element-Commercial.
+ * Please see LICENSE files in the repository root for full details.
+ */
+
+package io.element.android.libraries.matrix.api
+
+/**
+ * An abstraction over the Matrix SDK's `ClientBuilder` to allow sharing it with other modules without exposing the SDK directly.
+ */
+interface MatrixClientBuilder

libraries/matrix/api/src/main/kotlin/io/element/android/libraries/matrix/api/scanner/ContentScannerUrlProvider.kt

@@ -1,31 +0,0 @@
-/*
- * Copyright (c) 2026 Element Creations Ltd.
- *
- * SPDX-License-Identifier: AGPL-3.0-only OR LicenseRef-Element-Commercial.
- * Please see LICENSE files in the repository root for full details.
- */
-
-package io.element.android.libraries.matrix.api.scanner
-
-import io.element.android.libraries.matrix.api.ClientUrlContentFetcher
-import io.element.android.libraries.matrix.api.core.SessionId
-
-/**
- * Provides the URL of the content scanner service for a given homeserver, if any is set up.
- */
-fun interface ContentScannerUrlProvider {
-    /**
-     * Returns the URL of the content scanner service for the given [sessionId], or `null` if no content scanner is set up.
-     */
-    suspend fun getContentScannerUrl(sessionId: SessionId): Result<String?>
-
-    /**
-     * Creates a provider, which needs a fetcher because the scanner URL is itself discovered over HTTP.
-     */
-    fun interface Factory {
-        /**
-         * @param urlContentFetcher used to read the configuration advertised by the homeserver; a client that is not authenticated yet also works.
-         */
-        fun create(urlContentFetcher: ClientUrlContentFetcher): ContentScannerUrlProvider
-    }
-}