[#488] reputation: Change Writer interface

Includes:
- Delete first `ctx` argument in `Write` method.
- Move intermediate Initial trust struct and method
to `calculator` file.
- Change Alpha to 0.1.

Signed-off-by: Pavel Karpy <carpawell@nspcc.ru>

pkg/services/reputation/local/controller/calls.go

@@ -126,7 +126,7 @@ func (c *reportContext) report() {
 				return err
 			}
 
-			return targetWriter.Write(c.ctx, t)
+			return targetWriter.Write(t)
 		},
 	)
 	if err != nil && !errors.Is(err, context.Canceled) {