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.json

@@ -46,6 +46,8 @@
     "@types/mkdirp": "1.0.1",
     "@types/node-fetch": "2.5.7",
     "@xmldom/xmldom": "0.7.13",
+    "@xterm/xterm": "5.5.0",
+    "@xterm/addon-fit": "0.10.0",
     "allotment": "1.20.2",
     "applicationinsights": "1.8.0",
     "bootstrap": "3.4.1",