Percentage Parser
by SSShuai1999 @SSShuai1999
实现类型 PercentageParser。根据规则 `/^(\+|\-)?(\d*)?(\%)?$/` 匹配类型 T。
匹配的结果由三部分组成,分别是:[`正负号`, `数字`, `单位`],如果没有匹配,则默认是空字符串。
例如:
```ts
type PString1 = ''
type PString2 = '+85%'
type PString3 = '-85%'
type PString4 = '85%'
type PString5 = '85'
type R1 = PercentageParser // expected ['', '', '']
type R2 = PercentageParser // expected ["+", "85", "%"]
type R3 = PercentageParser // expected ["-", "85", "%"]
type R4 = PercentageParser // expected ["", "85", "%"]
type R5 = PercentageParser // expected ["", "85", ""]
```