feature: add type

[frank-zsy]

在 column 中加入 type 字段，使其可以做预处理或校验

Signed-off-by: Frankzhaopku syzhao1988@126.com

[codecov-io]

Codecov Report

Merging #17 into master will not change coverage.
The diff coverage is 0%.

@@           Coverage Diff           @@
##           master      #17   +/-   ##
=======================================
  Coverage   56.66%   56.66%           
=======================================
  Files          10       10           
  Lines          60       60           
=======================================
  Hits           34       34           
  Misses         26       26

Impacted Files	Coverage Δ
app/schema/table_hotel.ts	100% <ø> (ø)	⬆️
app/schema/table_hospital.ts	100% <ø> (ø)	⬆️
app/schema/table_logistical.ts	100% <ø> (ø)	⬆️
app/service/github.ts	21.42% <0%> (ø)	⬆️

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