feat(filesystem): rewrite filesystem interface for better compatability

pubspec.lock

@@ -50,13 +50,6 @@ packages:
       url: "https://pub.dartlang.org"
     source: hosted
     version: "2.0.2"
-  boolean_selector:
-    dependency: transitive
-    description:
-      name: boolean_selector
-      url: "https://pub.dartlang.org"
-    source: hosted
-    version: "2.1.0"
   build:
     dependency: transitive
     description:
@@ -204,13 +197,6 @@ packages:
       url: "https://pub.dartlang.org"
     source: hosted
     version: "3.0.1"
-  cross_file:
-    dependency: transitive
-    description:
-      name: cross_file
-      url: "https://pub.dartlang.org"
-    source: hosted
-    version: "0.3.2"
   crypto:
     dependency: transitive
     description:
@@ -309,13 +295,6 @@ packages:
       url: "https://pub.dartlang.org"
     source: hosted
     version: "2.0.1"
-  fake_async:
-    dependency: transitive
-    description:
-      name: fake_async
-      url: "https://pub.dartlang.org"
-    source: hosted
-    version: "1.2.0"
   ffi:
     dependency: transitive
     description:
@@ -337,20 +316,6 @@ packages:
       url: "https://pub.dartlang.org"
     source: hosted
     version: "4.5.1"
-  file_selector_macos:
-    dependency: "direct main"
-    description:
-      name: file_selector_macos
-      url: "https://pub.dartlang.org"
-    source: hosted
-    version: "0.8.2"
-  file_selector_platform_interface:
-    dependency: "direct main"
-    description:
-      name: file_selector_platform_interface
-      url: "https://pub.dartlang.org"
-    source: hosted
-    version: "2.0.4"
   firebase_auth:
     dependency: "direct main"
     description:
@@ -522,11 +487,6 @@ packages:
       url: "https://pub.dartlang.org"
     source: hosted
     version: "5.1.0"
-  flutter_test:
-    dependency: transitive
-    description: flutter
-    source: sdk
-    version: "0.0.0"
   flutter_web_plugins:
     dependency: transitive
     description: flutter
@@ -1258,13 +1218,6 @@ packages:
       url: "https://pub.dartlang.org"
     source: hosted
     version: "1.2.0"
-  test_api:
-    dependency: transitive
-    description:
-      name: test_api
-      url: "https://pub.dartlang.org"
-    source: hosted
-    version: "0.4.8"
   timing:
     dependency: transitive
     description: