Use v2 Resources API architecture in azure appservice tree items

[ccastrotrejo]

Main Issue Here

Azure Logic Apps Standard vscode extension uses the @microsoft/vscode-azext-azureappservice library to render the DeploymentsTreeItem, AppSettingsTreeItem, LogFilesTreeItem and SiteFilesTreeItem. However, these tree items aren't updated to the v2 architecture. Making it a big blocker for us to move forward with the architecture update.

[alexweininger]

We recognize that this is a big blocker and we'll prioritize this appropriately.

[ccastrotrejo]

Thank you so much Alex, we really appreciate it!