feat: add in-memory sequencer

[stulzq]

What this PR does:
Add in-memory sequencer
Which issue(s) this PR fixes:

None
Special notes for your reviewer:

Does this PR introduce a user-facing change?:

[codecov]

Codecov Report

Merging #398 (3b082a3) into main (13f5154) will increase coverage by 0.13%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main     #398      +/-   ##
==========================================
+ Coverage   59.70%   59.83%   +0.13%     
==========================================
  Files         115      116       +1     
  Lines        6177     6197      +20     
==========================================
+ Hits         3688     3708      +20     
  Misses       2128     2128              
  Partials      361      361              

Impacted Files	Coverage Δ
...ponents/sequencer/in-memory/in_memory_sequencer.go	100.00% <100.00%> (ø)

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[seeflood]

lgtm

[zhenjunMa]

Sorry for the late reply and thanks for your contribution!

[seeflood]

This component can make debug easier.Thanks !