Removed unused files, code cleanup

pubspec.lock

@@ -5,18 +5,34 @@ packages:
     dependency: transitive
     description:
       name: _fe_analyzer_shared
-      sha256: "0c80aeab9bc807ab10022cd3b2f4cf2ecdf231949dc1ddd9442406a003f19201"
+      sha256: "8c7478991c7bbde2c1e18034ac697723176a5d3e7e0ca06c7f9aed69b6f388d7"
       url: "https://pub.dev"
     source: hosted
-    version: "52.0.0"
+    version: "51.0.0"
   analyzer:
     dependency: transitive
     description:
       name: analyzer
-      sha256: cd8ee83568a77f3ae6b913a36093a1c9b1264e7cb7f834d9ddd2311dade9c1f4
+      sha256: "120fe7ce25377ba616bb210e7584983b163861f45d6ec446744d507e3943881b"
       url: "https://pub.dev"
     source: hosted
-    version: "5.4.0"
+    version: "5.3.1"
+  analyzer_plugin:
+    dependency: transitive
+    description:
+      name: analyzer_plugin
+      sha256: c1d5f167683de03d5ab6c3b53fc9aeefc5d59476e7810ba7bbddff50c6f4392d
+      url: "https://pub.dev"
+    source: hosted
+    version: "0.11.2"
+  ansicolor:
+    dependency: transitive
+    description:
+      name: ansicolor
+      sha256: "607f8fa9786f392043f169898923e6c59b4518242b68b8862eb8a8b7d9c30b4a"
+      url: "https://pub.dev"
+    source: hosted
+    version: "2.0.1"
   archive:
     dependency: transitive
     description:
@@ -305,6 +321,22 @@ packages:
       url: "https://pub.dev"
     source: hosted
     version: "0.17.2"
+  dart_code_metrics:
+    dependency: "direct dev"
+    description:
+      name: dart_code_metrics
+      sha256: "95f22e95638c0dfb0cb4e3ba45e00bb06dd509c98f06d4c0fa45340b0a5392e0"
+      url: "https://pub.dev"
+    source: hosted
+    version: "5.4.0"
+  dart_code_metrics_presets:
+    dependency: transitive
+    description:
+      name: dart_code_metrics_presets
+      sha256: "43dc1fdcb424fc3aa79964304d09eeda4f199351c52cdc854f8228a9d0296b60"
+      url: "https://pub.dev"
+    source: hosted
+    version: "1.1.0"
   dart_style:
     dependency: transitive
     description:
@@ -1276,6 +1308,14 @@ packages:
       url: "https://pub.dev"
     source: hosted
     version: "2.1.3"
+  pub_updater:
+    dependency: transitive
+    description:
+      name: pub_updater
+      sha256: "00e42b515aa046b171d05bbe2dd566c0feaab7808c33c5bacb5beff93cf16561"
+      url: "https://pub.dev"
+    source: hosted
+    version: "0.2.3"
   pubspec_parse:
     dependency: transitive
     description: