v0.4.55-nightly

What's Changed

Features

• [store] feature: add RaftLog::get(index) to get a single log. (#1103) by @drmingdrmer
• [store] feature: add RaftLog: a sled db backed raft log storage (#1078) by @drmingdrmer

Improvement

• [pipeline] add mixed processor (#1098) by @sundy-li

Others

• [store] feature: add RaftLog::get(index) to get a single log. (#1103) by @drmingdrmer
• [store] feature: add RaftLog: a sled db backed raft log storage (#1078) by @drmingdrmer