internal/value: 抽象 Value 接口与基于反射的实现

[flycash]

• 将元数据抽象挪到 internal/model 包
• 将方言抽象挪到 intenal/dialect 包
• 抽象了 Value 接口并且提供了基于反射的实现

[codecov]

Codecov Report

Merging #60 (19b5953) into main (1dc491e) will decrease coverage by 0.41%.
The diff coverage is 93.33%.

@@            Coverage Diff             @@
##             main      #60      +/-   ##
==========================================
- Coverage   85.29%   84.87%   -0.42%     
==========================================
  Files          14       15       +1     
  Lines         809      833      +24     
==========================================
+ Hits          690      707      +17     
- Misses        101      107       +6     
- Partials       18       19       +1     

Impacted Files	Coverage Δ
update.go	83.33% <84.61%> (ø)
builder.go	77.35% <87.50%> (ø)
internal/model/model.go	90.54% <93.10%> (ø)
select.go	89.94% <93.33%> (ø)
db.go	100.00% <100.00%> (ø)
delete.go	55.55% <100.00%> (ø)
insert.go	89.70% <100.00%> (ø)
internal/value/reflect/value.go	100.00% <100.00%> (ø)

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