feat(fs): resolve content URIs on Android (#1658)

* Implemented writeTextFile on Android.

* Added license headers.

* fix fmt checks.

* implement more file APIs

* change file

* cleanup

* refactor dialog plugin to leverage new FS APIs

* implement metadata functions

* fix build

* expose FS rust API

* resolve resources on android

* update pnpm

* update docs

---------

Co-authored-by: Lucas Nogueira <lucas@tauri.app>

plugins/fs/src/models.rs

@@ -0,0 +1,18 @@
+// Copyright 2019-2023 Tauri Programme within The Commons Conservancy
+// SPDX-License-Identifier: Apache-2.0
+// SPDX-License-Identifier: MIT
+
+use serde::{Deserialize, Serialize};
+
+#[derive(Debug, Clone, Default, Deserialize, Serialize)]
+#[serde(rename_all = "camelCase")]
+pub struct GetFileDescriptorPayload {
+    pub uri: String,
+    pub mode: String,
+}
+
+#[derive(Debug, Clone, Default, Deserialize, Serialize)]
+#[serde(rename_all = "camelCase")]
+pub struct GetFileDescriptorResponse {
+    pub fd: Option<i32>,
+}