feat: support xa protocol

[dk-lockdown]

ref: #259

Ⅰ. Describe what this PR did

support:

XA {START|BEGIN} xid 

XA END xid

XA PREPARE xid

XA COMMIT xid

XA ROLLBACK xid

Ⅱ. Does this pull request fix one issue?

Ⅲ. Why don't you add test cases (unit test/integration test)?

Ⅳ. Describe how to verify it

Ⅴ. Special notes for reviews

[codecov-commenter]

Codecov Report

Merging #261 (80af84e) into dev (97c5e18) will decrease coverage by 0.13%.
The diff coverage is 0.00%.

@@            Coverage Diff             @@
##              dev     #261      +/-   ##
==========================================
- Coverage   43.38%   43.25%   -0.14%     
==========================================
  Files          82       82              
  Lines        9979    10009      +30     
==========================================
  Hits         4329     4329              
- Misses       5196     5226      +30     
  Partials      454      454              

Impacted Files	Coverage Δ
pkg/executor/read_write_splitting.go	42.59% <0.00%> (-3.18%)	⬇️
pkg/executor/single_db.go	44.62% <0.00%> (-3.92%)	⬇️

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