Port Wrap with Tag endpoint to cohosting

[davidwengier]

We currently have a WrapWithTagEndpoint, but we need to port it to cohosting.

• Create a new CohostWrapWithTagEndpoint in the LanguageServices.Razor project, next to the other cohost services
• Create a new IRemoteWrapWithTagService interface in the Workspaces project
• Create an entry in Services.props for the new service
• Create a new RemoteWrapWithTagService implementation in the Remote.Razor project
• Copy the logic for checking if the position in the request is valid, from WrapWithTagEndpoint to RemoteWrapWithTagService
• In CohostWrapWithTagEndpoint, call into the remote service to check position validity, and if its valid, call the WrapWithTag method in the Html server, via an IHtmlRequestInvoker
• After getting the result back from Html, fix the edits using the FixHtmlTextEdits method