TF-1822: Store and get html string to file in internal storage mobile

(cherry picked from commit 50b8c7862a5c9b6cbd856fd63bf61d9973723429)

core/pubspec.lock

@@ -121,6 +121,14 @@ packages:
       url: "https://pub.dev"
     source: hosted
     version: "2.0.5"
+  external_path:
+    dependency: "direct main"
+    description:
+      name: external_path
+      sha256: "2095c626fbbefe70d5a4afc9b1137172a68ee2c276e51c3c1283394485bea8f4"
+      url: "https://pub.dev"
+    source: hosted
+    version: "1.0.3"
   fake_async:
     dependency: transitive
     description:
@@ -352,6 +360,54 @@ packages:
       url: "https://pub.dev"
     source: hosted
     version: "1.0.1"
+  path_provider:
+    dependency: "direct main"
+    description:
+      name: path_provider
+      sha256: "04890b994ee89bfa80bf3080bfec40d5a92c5c7a785ebb02c13084a099d2b6f9"
+      url: "https://pub.dev"
+    source: hosted
+    version: "2.0.13"
+  path_provider_android:
+    dependency: transitive
+    description:
+      name: path_provider_android
+      sha256: "2cec049d282c7f13c594b4a73976b0b4f2d7a1838a6dd5aaf7bd9719196bee86"
+      url: "https://pub.dev"
+    source: hosted
+    version: "2.0.27"
+  path_provider_foundation:
+    dependency: transitive
+    description:
+      name: path_provider_foundation
+      sha256: ad4c4d011830462633f03eb34445a45345673dfd4faf1ab0b4735fbd93b19183
+      url: "https://pub.dev"
+    source: hosted
+    version: "2.2.2"
+  path_provider_linux:
+    dependency: transitive
+    description:
+      name: path_provider_linux
+      sha256: "2ae08f2216225427e64ad224a24354221c2c7907e448e6e0e8b57b1eb9f10ad1"
+      url: "https://pub.dev"
+    source: hosted
+    version: "2.1.10"
+  path_provider_platform_interface:
+    dependency: "direct main"
+    description:
+      name: path_provider_platform_interface
+      sha256: c2af5a8a6369992d915f8933dfc23172071001359d17896e83db8be57db8a397
+      url: "https://pub.dev"
+    source: hosted
+    version: "2.0.1"
+  path_provider_windows:
+    dependency: transitive
+    description:
+      name: path_provider_windows
+      sha256: d3f80b32e83ec208ac95253e0cd4d298e104fbc63cb29c5c69edaed43b0c69d6
+      url: "https://pub.dev"
+    source: hosted
+    version: "2.1.6"
   petitparser:
     dependency: transitive
     description:
@@ -360,14 +416,22 @@ packages:
       url: "https://pub.dev"
     source: hosted
     version: "5.1.0"
-  plugin_platform_interface:
+  platform:
     dependency: transitive
     description:
-      name: plugin_platform_interface
-      sha256: "6a2128648c854906c53fa8e33986fc0247a1116122f9534dd20e3ab9e16a32bc"
+      name: platform
+      sha256: "4a451831508d7d6ca779f7ac6e212b4023dd5a7d08a27a63da33756410e32b76"
       url: "https://pub.dev"
     source: hosted
-    version: "2.1.4"
+    version: "3.1.0"
+  plugin_platform_interface:
+    dependency: "direct dev"
+    description:
+      name: plugin_platform_interface
+      sha256: c384b19bf8d317b3d1576327203cdc95f96bf5f109ab63ab72690fe32fdb0d3c
+      url: "https://pub.dev"
+    source: hosted
+    version: "2.1.0"
   pointer_interceptor:
     dependency: "direct main"
     description:
@@ -376,6 +440,14 @@ packages:
       url: "https://pub.dev"
     source: hosted
     version: "0.9.1"
+  process:
+    dependency: transitive
+    description:
+      name: process
+      sha256: "53fd8db9cec1d37b0574e12f07520d582019cb6c44abf5479a01505099a34a09"
+      url: "https://pub.dev"
+    source: hosted
+    version: "4.2.4"
   sky_engine:
     dependency: transitive
     description: flutter
@@ -557,6 +629,14 @@ packages:
       url: "https://pub.dev"
     source: hosted
     version: "4.1.1"
+  xdg_directories:
+    dependency: transitive
+    description:
+      name: xdg_directories
+      sha256: ee1505df1426458f7f60aac270645098d318a8b4766d85fde75f76f2e21807d1
+      url: "https://pub.dev"
+    source: hosted
+    version: "1.0.0"
   xml:
     dependency: transitive
     description: