Add Azure Monitor Extension (#15397)

* Added Azure Log Analytics resource for generating AAD Token.

* Fixed AzureResource

* Removed debug code from connectionManagementService

* Moved AzureLogAnalytics from AzureResource enum in azdata.d.ts to azdata.proposed.d.ts.  Added azureLogAnalyticsResource to all azureSettings in providerSettings.ts

* Updated endpoint for generating AAD Token for LogAnalytics for UsGov, UsNat, and China

* Initial Commit of Azure Monitor Extension

* Added extension name to azuremonitor package strings

* Removed azureMonitor resource from germanyCloud in providerSettings

* Added logic to exclude menuItems in object explorer for LogAnalytics

* Changed exe from AzureMonitor to Kusto

* Added if clause for queryName for new queries

* Changed queryWindow name from KustoQuery to KQLQuery for Kusto and LogAnalytics.

* Added LogAnalytics for setTaskBarContent

* Added serialization and telemetry feature classes to AzureMonitor. Added references for azdata and vscode.

* Added azure monitor light and dark icons

* Added config for Dashboard in package.json

* Added workspace information to dashboard

* Added language support for LogAnalytics

* Added Notebook support

* Added Hide flag to package.json for databaseName

* Changed providerId from LogAnalytics to LOGANALYTICS

* Changed Workspace to Workspace ID in package.nls.json

* Added support for Azure Widget browser

* Changed fullName to use workspaceId when connecting

* Changed providerId from alertsManagement to azureMonitor

* Added .gitignore and *.vsix to vscodeignore.

* Removed unused devDependencies

* Code Review Feedback

* Changed tsconfig.json to match Kusto and Sql

* Changed package.json to match kusto package.

* Changed tsconfig to validate unused params and implictAny. Changed existing code to satisfy build.

* Fixed tsconfig to use the correct base class.

* Added objectExplorerNodeProvider and all related classes.

* Removed unused tmLanguage file

* Added logic to to download extension from toolservice

* Fixed launchArgs. Removed commented code from extension.ts. Changed config.json to use net5.0

* Added displayName to package.nls.json. Removed hide flag from databaseName. Other code review feedback.

* Added readme info to AzureMonitor

* Removed unused client-error-handler and ui-references files. Combined outputChannel in azuremonitorServer. Removed TODO from contextProvider. Renamed function in extension.ts. Removed unneeded 'use strict' from cancelableStream.ts. Removed second outputChannel from objectExplorerNodeProvider.

* Removed unused files

extensions/azuremonitor/resources/dark/azure_monitor_dark.svg

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