handle leave cluster event

[JacksonYao287]

in nuobject, when a member is moved out of a raft group, we should clear the pg related resource in the member , which will be done in the config change handler. this PR aims to add this interface, which is also helpful for other use case to reclaim their application layer resource

[codecov-commenter]

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Codecov Report

Attention: Patch coverage is 54.28571% with 16 lines in your changes missing coverage. Please review.

Project coverage is 66.60%. Comparing base (1a0cef8) to head (73bd8c2). Report is 94 commits behind head on master.

Files with missing lines	Patch %	Lines
src/lib/blkalloc/append_blk_allocator.cpp	0.00%	5 Missing :warning:
src/lib/replication/repl_dev/raft_repl_dev.cpp	60.00%	4 Missing :warning:
src/include/homestore/replication/repl_dev.h	0.00%	1 Missing :warning:
src/lib/blkalloc/bitmap_blk_allocator.h	0.00%	1 Missing :warning:
src/lib/blkalloc/fixed_blk_allocator.h	0.00%	1 Missing :warning:
src/lib/blkalloc/varsize_blk_allocator.h	0.00%	1 Missing :warning:
src/lib/device/vchunk.cpp	0.00%	1 Missing :warning:
...rc/lib/replication/repl_dev/raft_state_machine.cpp	91.66%	0 Missing and 1 partial :warning:
src/lib/replication/repl_dev/solo_repl_dev.h	0.00%	1 Missing :warning:

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Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #594 +/- ## =========================================== + Coverage 56.51% 66.60% +10.09% =========================================== Files 108 109 +1 Lines 10300 10772 +472 Branches 1402 1472 +70 =========================================== + Hits 5821 7175 +1354 + Misses 3894 2893 -1001 - Partials 585 704 +119 ```

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[JacksonYao287]

like on_joining_cluster, on_leaving_cluster

this is a good suggestion, will make this change

[xiaoxichen]

Then in this case, should we use https://github.com/eBay/NuRaft/blob/092997ab67eb2529c5b40556e1d301c8220c315d/include/libnuraft/callback.hxx#L95 and https://github.com/eBay/NuRaft/blob/092997ab67eb2529c5b40556e1d301c8220c315d/include/libnuraft/callback.hxx#L101

more callback type can be consumed from handle_raft_event

[JacksonYao287]

more callback type can be consumed from handle_raft_event

1 in this PR , I only want to handle the leave cluster case. we can create another PR for join cluster case

2 RemovedFromCluster callback will be called before the new configuration is applied , IMO, it is better to call it after the new configuration is applied, where we can guarantee the config changed is completed and the node is definitely removed from the cluster configuration

[xiaoxichen]

I hope the commits and commit message can be cleanup , there are two parts in this PR:

1. consume nuraft::cb_func::Type::RemovedFromCluster callback
2. add reset function to allocator/vchunk as a preparation for implementing m_listener->on_destroy()

The pr title/commit messages are a bit confusing.

[JacksonYao287]

The pr title/commit messages are a bit confusing.

sure, will refine this commit message