增加 result 抽象

[Stone-afk]

增加 result 抽象， 封装 sql.Result 接口，同时暴露一个 Err() 方法，用于返回 err 字段。并提供 LastInsertId()、RowsAffected() 的封装 。

[codecov[bot]]

Codecov Report

Merging #100 (c31b872) into main (eacfdac) will increase coverage by 0.71%. The diff coverage is 91.66%.

@@            Coverage Diff             @@
##             main     #100      +/-   ##
==========================================
+ Coverage   81.72%   82.44%   +0.71%     
==========================================
  Files          17       18       +1     
  Lines        1100     1128      +28     
==========================================
+ Hits          899      930      +31     
+ Misses        171      169       -2     
+ Partials       30       29       -1     

Impacted Files	Coverage Δ
db.go	68.88% <ø> (-4.70%)	:arrow_down:
update.go	83.33% <85.18%> (+0.42%)	:arrow_up:
builder.go	80.98% <100.00%> (+0.13%)	:arrow_up:
delete.go	92.50% <100.00%> (+15.57%)	:arrow_up:
insert.go	92.30% <100.00%> (+0.09%)	:arrow_up:
result.go	100.00% <100.00%> (ø)

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