[Datadog] Add link command (Azure#2658)

Author: limingu

src/datadog/azext_datadog/manual/_help.py

@@ -0,0 +1,16 @@
+# --------------------------------------------------------------------------------------------
+# Copyright (c) Microsoft Corporation. All rights reserved.
+# Licensed under the MIT License. See License.txt in the project root for license information.
+# --------------------------------------------------------------------------------------------
+
+from knack.help_files import helps
+
+helps['datadog link'] = """
+    type: group
+    short-summary: Link Datadog existing organization.
+"""
+
+helps['datadog link create'] = """
+    type: command
+    short-summary: The operation to link Datadog existing organization.
+"""

src/datadog/azext_datadog/manual/commands.py

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+# --------------------------------------------------------------------------------------------
+# Copyright (c) Microsoft Corporation. All rights reserved.
+# Licensed under the MIT License. See License.txt in the project root for license information.
+# --------------------------------------------------------------------------------------------
+
+from azure.cli.core.commands import CliCommandType
+
+
+def load_command_table(self, _):
+
+    with self.command_group('datadog link', is_experimental=True) as g:
+        g.custom_command('create', 'datadog_link_create')

src/datadog/azext_datadog/manual/custom.py

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+# --------------------------------------------------------------------------------------------
+# Copyright (c) Microsoft Corporation. All rights reserved.
+# Licensed under the MIT License. See License.txt in the project root for license information.
+# --------------------------------------------------------------------------------------------
+
+from azure.cli.core.util import open_page_in_browser, can_launch_browser, in_cloud_console
+
+
+def datadog_link_create():
+
+    url = 'https://us3.datadoghq.com/api/v1/liftr/oauth/start'
+    if can_launch_browser() and not in_cloud_console():
+        open_page_in_browser(url)
+    else:
+        print("There isn't an available browser to create an issue draft. You can copy and paste the url"
+              " below in a browser to submit.\n\n{}\n\n".format(url))
+
+    print("After login and authorize the linking, copy the code and client_id from the broswer address bar.\n"
+          "Use code as linking-auth-code and client_id as linking-client-id in monitor create command.\n"
+          "example:\n"
+          "    az datadog monitor create --name \"myMonitor\" --location \"West US 2\" --identity-type"
+          " \"SystemAssigned\" --sku-name \"Linked\" --datadog-organization-properties"
+          " linking-auth-code=\"copyFromCode\" linking-client-id=\"00000000-0000-0000-0000-000000000000\""
+          " --user-info name=\"Alice\" email-address=\"alice@microsoft.com\" phone-number=\"123-456-789\"")