fix: Resolve the inconsistency between member configuration and log index in snapshot meta

[panlei-coder]

1、解决在真正生成快照时，snapshot meta 保存的成员配置信息和实际的快照数据不一致问题，可能导致新加入的节点跳过成员变更日志，出现配置信息不一致的问题。#9
2、修改 set_self_replay_point 接口为 set_last_applied_index_and_term。

Summary by CodeRabbit

• New Features

  • Introduced a method for retrieving configuration entries by index in the PRaft class.
  • Enhanced snapshot metadata management to include configuration details of the last log index and associated learners.

• Bug Fixes

  • Updated warning message format in the InitLimit function for improved clarity.
  • Commented out the invocation of InitLimit in the main function to address potential startup issues.

• Documentation

  • Added a new header file for configuration management to support the updated functionality.

[coderabbitai]

Walkthrough

The changes involve updates to the braft library dependency version, modifications to the InitLimit function in src/pikiwidb.cc, and enhancements to the PRaft class in src/praft/praft.cc and its header file. New methods for configuration retrieval were introduced, and snapshot metadata handling was improved to include configuration details. These alterations reflect a shift towards more stable versions and refined functionality in the codebase.

Changes

Files	Change Summary
cmake/braft.cmake	Updated GIT_TAG from v1.1.2-alpha2 to v1.1.2.1, indicating a shift to a stable release version.
src/pikiwidb.cc	Modified InitLimit function to enhance warning message format; commented out its invocation in main, indicating potential issues with limit initialization during startup.
src/praft/praft.cc, src/praft/praft.h	Added new method GetConfigurationByIndex for retrieving configuration entries; changed method set_self_playback_point to set_last_applied_index_and_term, reflecting a change in log index handling.
src/praft/psnapshot.cc	Expanded snapshot metadata update process to include configuration details of the last log index and learners, ensuring accurate reflection of system state during snapshots.

Sequence Diagram(s)

sequenceDiagram
    participant User
    participant PikiwiDB
    participant PRaft
    participant Snapshot

    User->>PikiwiDB: Start Application
    PikiwiDB->>PikiwiDB: Commented out InitLimit
    PikiwiDB->>PRaft: Initialize PRaft
    PRaft->>PRaft: GetConfigurationByIndex
    PRaft->>Snapshot: Update Snapshot Metadata
    Snapshot->>Snapshot: Include Configuration Details
    Snapshot-->>User: Snapshot Ready

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🐇 "In the code where changes bloom,
A stable version clears the gloom.
With limits set and configs bright,
Our system hops to greater height!
So let us cheer, with joy we sing,
For every change, new hopes they bring!" 🌼

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[panlei-coder]

@hotjump @dingxiaoshuai123