feature: support globallock hint

[dk-lockdown]

ref: #14

Ⅰ. Describe what this PR did

Ⅱ. Does this pull request fix one issue?

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

there are unit test cases.

Ⅳ. Describe how to verify it

Ⅴ. Special notes for reviews

[codecov-commenter]

Codecov Report

Merging #57 (a4cc054) into dev (041a9e1) will decrease coverage by 3.25%.
The diff coverage is 70.00%.

@@            Coverage Diff             @@
##              dev      #57      +/-   ##
==========================================
- Coverage   34.22%   30.96%   -3.26%     
==========================================
  Files          42       46       +4     
  Lines        4947     5651     +704     
==========================================
+ Hits         1693     1750      +57     
- Misses       3085     3726     +641     
- Partials      169      175       +6     

Impacted Files	Coverage Δ
pkg/filter/dt/executor.go	4.53% <0.00%> (ø)
pkg/filter/dt/filter_mysql.go	17.24% <84.84%> (ø)
pkg/filter/dt/filter_http.go	3.44% <0.00%> (ø)
pkg/filter/dt/transaction.go	0.00% <0.00%> (ø)

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[adofsauron]

lgtm