[#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>

cmd/neofs-node/reputation/local/remote.go

@@ -69,7 +69,7 @@ type RemoteTrustWriter struct {
 	buf []*reputationapi.Trust
 }
 
-func (rtp *RemoteTrustWriter) Write(_ reputationcommon.Context, t reputation.Trust) error {
+func (rtp *RemoteTrustWriter) Write(t reputation.Trust) error {
 	apiTrust := reputationapi.NewTrust()
 
 	apiPeer := reputationapi.NewPeerID()