Initial content scanner integration (#7139)

* Create a `ContentScanner` component:

- Add `:features:contentscanner:api` module with the interface.
- Implement the concrete component using the Rust SDK in `:libraries:matrix:impl`.

This can be used to both set up the content scanner media fetching in the SDK Client and manually scanning media sources from the Android side

* Create `ContentScannerUrlProvider` in a new `:features:contentscaner:api` module as a noop implementation

Use it as a placeholder for the code to instantiate a `RustContentScanner` with the fetched URL and set it as part of the SDK client.

* Expose the optional `ContentScanner` in the `@SessionScope`

* Split the storage part of the Element well-known retriever so it can be reused for the non-session bound retriever.

Also add the new `content_scanner_url` field to it.

This will be used by the enterprise code to fetch the actual content scanner url.

* Bump enterprise commit to have access to the actual content scanner url provider implementation

* Fix tests and lint issues

* Use the right namespace for `:features:contentscanner:api`, also use the right namespace for `impl`

---------

Co-authored-by: Benoit Marty <benoitm@element.io>

features/contentscanner/api/build.gradle.kts

@@ -0,0 +1,23 @@
+plugins {
+    id("io.element.android-compose-library")
+    id("kotlin-parcelize")
+}
+
+android {
+    namespace = "io.element.android.features.contentscanner.api"
+}
+
+dependencies {
+    implementation(projects.libraries.core)
+    implementation(projects.libraries.architecture)
+    implementation(projects.libraries.matrix.api)
+    implementation(projects.libraries.matrixui)
+    implementation(projects.libraries.designsystem)
+
+    testImplementation(libs.test.junit)
+    testImplementation(libs.coroutines.test)
+    testImplementation(libs.molecule.runtime)
+    testImplementation(libs.test.truth)
+    testImplementation(libs.test.turbine)
+    testImplementation(projects.libraries.matrix.test)
+}

features/contentscanner/impl/build.gradle.kts

@@ -0,0 +1,35 @@
+/*
+ * 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.
+ */
+
+import extension.setupDependencyInjection
+
+plugins {
+    id("io.element.android-compose-library")
+    id("kotlin-parcelize")
+}
+
+android {
+    namespace = "io.element.android.features.contentscanner.impl"
+}
+
+setupDependencyInjection()
+
+dependencies {
+    api(projects.features.contentscanner.api)
+    implementation(projects.libraries.core)
+    implementation(projects.libraries.architecture)
+    implementation(projects.libraries.matrix.api)
+    implementation(projects.libraries.matrixui)
+    implementation(projects.libraries.designsystem)
+
+    testImplementation(libs.test.junit)
+    testImplementation(libs.coroutines.test)
+    testImplementation(libs.molecule.runtime)
+    testImplementation(libs.test.truth)
+    testImplementation(libs.test.turbine)
+    testImplementation(projects.libraries.matrix.test)
+}