feat(fs): improved API (#751)

* feat(fs): improved API

* fmt

* fix unix builds

* again

* clippy

* clippy

* fix import in docs examples

* fmt, clippy

* Update linux.rs

* add API for watch

* fix with `watcher` feature flag

* use baseDir for all commands

* do not export close function

* fix build

* organize and address review comments

* fmt

* generated files

* rename FsFile to FileHandle, move APIs and docs

* extend example

* extend `Resource`

* actually extend it

---------

Co-authored-by: FabianLars <fabianlars@fabianlars.de>
Co-authored-by: Lucas Nogueira <lucas@tauri.studio>

examples/api/src/views/Dialog.svelte

@@ -1,6 +1,6 @@
 <script>
   import { open, save, confirm } from "@tauri-apps/plugin-dialog";
-  import { readBinaryFile } from "@tauri-apps/plugin-fs";
+  import { readFile } from "@tauri-apps/plugin-fs";
 
   export let onMessage;
   export let insecureRenderHtml;
@@ -55,7 +55,7 @@
         } else {
           var pathToRead = typeof res === "string" ? res : res.path;
           var isFile = pathToRead.match(/\S+\.\S+$/g);
-          readBinaryFile(pathToRead)
+          readFile(pathToRead)
             .then(function (response) {
               if (isFile) {
                 if (