feat: implement sequencer api with mysql

[GimmeCyy]

What this PR does:
add sequencer api component by mysql

Which issue(s) this PR fixes:
Fixes #489

[seeflood]

Thanks!
To fix the CI error, you can make format and then git commit the changes

[ZLBer]

@GimmeCyy I answered you below #509

[codecov]

Codecov Report

Merging #605 (1f61009) into main (917485d) will decrease coverage by 0.03%.
The diff coverage is 58.40%.

❗ Current head 1f61009 differs from pull request most recent head 070be20. Consider uploading reports for the commit 070be20 to get more accurate results

@@            Coverage Diff             @@
##             main     #605      +/-   ##
==========================================
- Coverage   60.62%   60.58%   -0.04%     
==========================================
  Files         125      127       +2     
  Lines        6539     6652     +113     
==========================================
+ Hits         3964     4030      +66     
- Misses       2195     2235      +40     
- Partials      380      387       +7     

Impacted Files	Coverage Δ
components/pkg/utils/mysql.go	0.00% <0.00%> (ø)
components/sequencer/mysql/mysql.go	76.74% <76.74%> (ø)

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[ZLBer]

finally add some docs below docs/en/component_specs/sequencer docs/zh/component_specs/sequencer

[ZLBer]

@GimmeCyy 本地的锁似乎是没用的，layotto可能是多机部署。可以先交流下再写代码~

[ZLBer]

LGTM

[seeflood]

lgtm.

[seeflood]

@GimmeCyy Thanks for your help!