Shell: Integrate Cloudshell to existing shells (#2098)

* first draft

* refactored code

* ux fix

* add custom header support and fix ui

* minor changes

* hide last command also

* remove logger

* bug fixes

* updated loick file

* fix tests

* moved files

* update readme

* documentation update

* fix compilationerror

* undefined check handle

* format fix

* format fix

* fix lints

* format fix

* fix unrelatred test

* code refator

* fix format

* ut fix

* cgmanifest

* Revert "cgmanifest"

This reverts commit 2e76a6926ee0d3d4e0510f2e04e03446c2ca8c47.

* fix snap

* test fix

* formatting code

* updated xterm

* include username in command

* cloudshell add exit

* fix test

* format fix

* tets fix

* fix multiple open cloudshell calls

* socket time out after 20 min

* remove unused code

* 120 min

* Addressed comments

package-lock.json

@@ -51,6 +51,8 @@
         "@types/mkdirp": "1.0.1",
         "@types/node-fetch": "2.5.7",
         "@xmldom/xmldom": "0.7.13",
+        "@xterm/addon-fit": "0.10.0",
+        "@xterm/xterm": "5.5.0",
         "allotment": "1.20.2",
         "applicationinsights": "1.8.0",
         "bootstrap": "3.4.1",
@@ -13240,6 +13242,19 @@
         "node": ">=10.0.0"
       }
     },
+    "node_modules/@xterm/addon-fit": {
+      "version": "0.10.0",
+      "resolved": "https://registry.npmjs.org/@xterm/addon-fit/-/addon-fit-0.10.0.tgz",
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+      "peerDependencies": {
+        "@xterm/xterm": "^5.0.0"
+      }
+    },
+    "node_modules/@xterm/xterm": {
+      "version": "5.5.0",
+      "resolved": "https://registry.npmjs.org/@xterm/xterm/-/xterm-5.5.0.tgz",
+      "integrity": "sha512-hqJHYaQb5OptNunnyAnkHyM8aCjZ1MEIDTQu1iIbbTD/xops91NB5yq1ZK/dC2JDbVWtF23zUtl9JE2NqwT87A=="
+    },
     "node_modules/@xtuc/ieee754": {
       "version": "1.2.0",
       "license": "BSD-3-Clause"