Merge branch 'topic/add-gpr-open-change-close-document-diagnostics-support-in-als' into 'master'

Add GPR open/change/close document & diagnostics support in ALS

See merge request eng/ide/ada_language_server!1214

Author: reznikmm

source/ada/lsp-ada_driver.adb

@@ -93,7 +93,8 @@ procedure LSP.Ada_Driver is
    Stream      : aliased LSP.Stdio_Streams.Stdio_Stream;
    Ada_Handler : aliased LSP.Ada_Handlers.Message_Handler
      (Server'Access, Server_Trace);
-   GPR_Handler : aliased LSP.GPR_Handlers.Message_Handler;
+   GPR_Handler : aliased LSP.GPR_Handlers.Message_Handler
+     (Server'Access, Server_Trace);
 
    Error_Decorator : aliased LSP.Error_Decorators.Error_Decorator
      (Server_Trace,