* 3644 Added RequestSecurityTokenParams, RequestSecurityTokenResponse, and SecurityTokenRequest to Kusto/contracts.ts. Added AccountFeature to features.ts. Registered feature in kustoServer.ts
* 3644 Removed TryCatch in kusto features > getToken
* 3644 Added AccountId to Kusto > RequestSecurityTokenParams. Refactored kusto features getToken to use the accountId for the query window.
* 3644 Removed unused AccountQuickPickItem
* 3707 Changed getIconpath in serverTreeRenderer to always set iconPath if iconId is undefined. Changed renderConnection to always renderServerIcon
* 3707 Added default flag to KustoIcon in package.json
* fix caching issue
* 3707 Changed default to optional variable. Updated asyncServerTreeRenderer > getIconPath to check for default
* 3707 Changed logic for setting iconPath in getIconPath
Co-authored-by: chgagnon <chgagnon@microsoft.com>