Use ClientWriteResponse to replace AddLearnerResponse

[drmingdrmer]

In openraft adds a learner is done by committing a membership config log, which is almost the same as committing any log.

AddLearnerResponse contains a field matched to indicate the replication state to the learner, which is not included in ClientWriteResponse. This information can be retrieved via Raft::metrics().

Therefore to keep the API simple, replace AddLearnerResponse with ClientWriteResponse.

AddLearnerResponse:

openraft/openraft/src/raft.rs

Lines 855 to 861 in 4a85ee9

	pub struct AddLearnerResponse<NID: NodeId> {
	/// The log id of the membership that contains the added learner.
	pub membership_log_id: Option<LogId<NID>>,
	/// The last log id that matches leader log.
	pub matched: Option<LogId<NID>>,
	}

ClientWriteResponse:

openraft/openraft/src/raft.rs

Lines 1266 to 1275 in 4a85ee9

	pub struct ClientWriteResponse<C: RaftTypeConfig> {
	/// The id of the log that is applied.
	pub log_id: LogId<C::NodeId>,
	/// Application specific response data.
	pub data: C::R,
	/// If the log entry is a change-membership entry.
	pub membership: Option<Membership<C::NodeId, C::Node>>,
	}

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