Affected types:
- Membership types;
- RPC request and response types;
- Error types;

Upgrade tip:

To adapt to this change, update type parameters with the single generic `C` constrained by `RaftTypeConfig`:

```rust,ignore

// Membership types:

MembershipState<NID, N>     --> MembershipState<C>
EffectiveMembership<NID, N> --> EffectiveMembership<C>
Membership<NID, N>          --> Membership<C>

// RPC types:

VoteRequest<NID>             --> VoteRequest<C>
VoteResponse<NID>            --> VoteResponse<C>
AppendEntriesResponse<NID>   --> AppendEntriesResponse<C>
InstallSnapshotResponse<NID> --> InstallSnapshotResponse<C>
SnapshotResponse<NID>        --> SnapshotResponse<C>
SnapshotMeta<NID, N>         --> SnapshotMeta<C>

// Errors:

InitializeError<NID, N>    --> InitializeError<C>
NotInMembers<NID, N>       --> NotInMembers<C>
ClientWriteError<NID>      --> ClientWriteError<C>
CheckIsLeaderError<NID>    --> CheckIsLeaderError<C>
RaftError<NID, E>          --> RaftError<C, E>
RPCError<NID, N, E>        --> RPCError<C, E>
RemoteError<NID, N, E>     --> RemoteError<C, E>
ChangeMembershipError<NID> --> ChangeMembershipError<C>
ForwardToLeader<NID, N>    --> ForwardToLeader<C>
HigherVote<NID>            --> HigherVote<C>
InProgress<NID>            --> InProgress<C>
LearnerNotFound<NID>       --> LearnerNotFound<C>
NotAllowed<NID>            --> NotAllowed<C>
QuorumNotEnough<NID>       --> QuorumNotEnough<C>
Timeout<NID>               --> Timeout<C>
RejectVoteRequest<NID>     --> RejectVoteRequest<C>
RejectAppendEntries<NID>   --> RejectAppendEntries<C>
Fatal<NID>                 --> Fatal<C>
```