eorm: 改为依赖 value 包来获取值

[flycash]

在引入了 value 抽象之后，在整个 ORM 中都不应该再依赖反射来取值，或者设置值，而是依赖于内部的 value 包。因为在以后我们计划提供 unsafe 的实现

[codecov[bot]]

Codecov Report

Merging #62 (cd82bf2) into main (93736e7) will decrease coverage by 0.07%. The diff coverage is 84.61%.

@@            Coverage Diff             @@
##             main      #62      +/-   ##
==========================================
- Coverage   84.87%   84.80%   -0.08%     
==========================================
  Files          15       15              
  Lines         833      829       -4     
==========================================
- Hits          707      703       -4     
  Misses        107      107              
  Partials       19       19              

Impacted Files	Coverage Δ
builder.go	77.35% <50.00%> (ø)
select.go	89.94% <75.00%> (ø)
update.go	82.90% <75.00%> (-0.43%)	:arrow_down:
insert.go	89.55% <100.00%> (-0.16%)	:arrow_down:
internal/value/reflect.go	100.00% <100.00%> (ø)

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