[WIP] support column encryption

[dk-lockdown]

ref: #24

Ⅰ. Describe what this PR did

INSERT INTO departments (id,dept_no,dept_name) VALUES (1,'1001','sunset')

will be rewrite to:

INSERT INTO departments (id,dept_no,dept_name) VALUES (1,'1001','3d244141cb5b6f921923f7f88f073941')

UPDATE departments SET dept_name='moonlight' WHERE id=1

will be rewrite to:

UPDATE departments SET dept_name='5cdeb84b8fc3c22fd6c3e37ca6d837da' WHERE id=1

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

check ci result

Ⅴ. Special notes for reviews

[codecov-commenter]

Codecov Report

Merging #202 (dc08117) into dev (d4a162b) will decrease coverage by 0.52%.
The diff coverage is 25.00%.

❗ Current head dc08117 differs from pull request most recent head c407313. Consider uploading reports for the commit c407313 to get more accurate results

@@            Coverage Diff             @@
##              dev     #202      +/-   ##
==========================================
- Coverage   42.68%   42.15%   -0.53%     
==========================================
  Files          81       82       +1     
  Lines        9606     9804     +198     
==========================================
+ Hits         4100     4133      +33     
- Misses       5099     5248     +149     
- Partials      407      423      +16     

Impacted Files	Coverage Δ
pkg/executor/sharding.go	0.00% <0.00%> (ø)
pkg/filter/dt/filter_http_transaction.go	0.00% <ø> (ø)
pkg/misc/crypto.go	0.00% <0.00%> (ø)
pkg/misc/hint.go	0.00% <0.00%> (ø)
pkg/executor/misc.go	32.14% <17.39%> (-67.86%)	⬇️
pkg/executor/single_db.go	49.11% <55.55%> (+1.22%)	⬆️
pkg/executor/read_write_splitting.go	46.25% <58.97%> (-0.09%)	⬇️
pkg/plan/result.go	63.80% <80.00%> (ø)

[bohehe]

LGTM