Add Membership test

[ppamorim]

HI, as requested, I implemented the test required for crash that I am experiencing in my application.

Here is the demo for the crash in my application:

https://github.com/ppamorim/openraft/tree/bincode-bug/example-raft-kv

You will need to run ./test-cluster.sh, wait it to finish and read the log n1.log. The code that causes the crash is here: https://github.com/ppamorim/openraft/blob/bincode-bug/example-raft-kv/src/store/mod.rs#L230-L244

The struct that causes the problem is here: https://github.com/datafuselabs/openraft/blob/main/openraft/src/membership/membership.rs#L21

[VictorKoenders]

Found some compatibility problems, see #503 for more info

[ppamorim]

I am a disaster to rebase with merged branches.

[codecov]

Codecov Report

Merging #500 (357b809) into trunk (75a2e0b) will increase coverage by 0.14%.
The diff coverage is 100.00%.

❗ Current head 357b809 differs from pull request most recent head 540c703. Consider uploading reports for the commit 540c703 to get more accurate results

@@            Coverage Diff             @@
##            trunk     #500      +/-   ##
==========================================
+ Coverage   70.72%   70.86%   +0.14%     
==========================================
  Files          46       47       +1     
  Lines        3149     3165      +16     
==========================================
+ Hits         2227     2243      +16     
  Misses        922      922              

Impacted Files	Coverage Δ
compatibility/src/lib.rs	51.78% <ø> (ø)
compatibility/src/membership.rs	100.00% <100.00%> (ø)

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