add grpcwrap function methods to make it compile

internal/grpcwrap/provider.go

@@ -393,6 +393,16 @@ func (p *provider) ReadDataSource(_ context.Context, req *tfplugin5.ReadDataSour
 	return resp, nil
 }
 
+func (p *provider) GetFunctions(context.Context, *tfplugin5.GetFunctions_Request) (*tfplugin5.GetFunctions_Response, error) {
+	panic("unimplemented")
+	return nil, nil
+}
+
+func (p *provider) CallFunction(_ context.Context, req *tfplugin5.CallFunction_Request) (*tfplugin5.CallFunction_Response, error) {
+	panic("unimplemented")
+	return nil, nil
+}
+
 func (p *provider) Stop(context.Context, *tfplugin5.Stop_Request) (*tfplugin5.Stop_Response, error) {
 	resp := &tfplugin5.Stop_Response{}
 	err := p.provider.Stop()

internal/grpcwrap/provider6.go

@@ -393,6 +393,16 @@ func (p *provider6) ReadDataSource(_ context.Context, req *tfplugin6.ReadDataSou
 	return resp, nil
 }
 
+func (p *provider6) GetFunctions(context.Context, *tfplugin6.GetFunctions_Request) (*tfplugin6.GetFunctions_Response, error) {
+	panic("unimplemented")
+	return nil, nil
+}
+
+func (p *provider6) CallFunction(_ context.Context, req *tfplugin6.CallFunction_Request) (*tfplugin6.CallFunction_Response, error) {
+	panic("unimplemented")
+	return nil, nil
+}
+
 func (p *provider6) StopProvider(context.Context, *tfplugin6.StopProvider_Request) (*tfplugin6.StopProvider_Response, error) {
 	resp := &tfplugin6.StopProvider_Response{}
 	err := p.provider.Stop()