A complex url parameter parser for rest filter queries
``` age=lt.13&(student=eq.true|gender=eq.M)&groupby=sum(age),grade,gender&having=min(age)=gt.13&orderby=age.desc,height.asc&page=20&page_size=100&x=123&y=456
``` Will resolve into
```rust Query { filters: [ Filter { connector: None, condition: Condition { left: Column("age"), equality: LT, right: Number(13) }, subfilter: [ Filter { connector: Some(AND), condition: Condition { left: Column("student"), equality: EQ, right: Boolean(true) }, subfilter: [ Filter { connector: Some(OR), condition: Condition { left: Column("gender"), equality: EQ, right: Column("M") }, } ] } ] } ], groupby: [ Function( Function { function: "sum", params: [Column("age")] } ), Column("grade"), Column("gender") ], having: [ Filter { connector: None, condition: Condition { left: Function( Function { function: "min", params: [Column("age")] } ), equality: GT, right: Number(13) }, } ], orderby: [ Order { column: "age", direction: DESC }, Order { column: "height", direction: ASC } ], range: Some(Page( Page{ page: 20, page_size:100 } )), equations: [ Equation { left: Column("x"), right: Number(123) }, Equation { left: Column("y"), right: Number(456) } ] }
```
Inspired by Postgrest Filter expressions
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