feat(typing-safe): add support to kotlin typing safe

README.md

@@ -261,6 +261,17 @@ List<User> getUsers(MagicFilter filter, @AuthenticationPrincipal User currentUse
 }
 ```
 
+## Kotlin typing safe
+
+When using Kotlin is possible to use the helpers functions to write typing safe queries:
+
+```kotlin
+val filter = mapOf(
+  User::name.like("Matthew"),
+  User::age.gt(20)
+).toR2dbcMagicFilter()
+```
+
 ## Advanced Postgres Function
 
 Execute the following piece of code on your db, [more info](https://stackoverflow.com/a/11007216/5795553): 

src/main/kotlin/io/github/verissimor/lib/r2dbcmagicfilter/KotlinUtil.kt

@@ -0,0 +1,27 @@
+package io.github.verissimor.lib.r2dbcmagicfilter
+
+import org.springframework.util.LinkedMultiValueMap
+import org.springframework.util.MultiValueMap
+import kotlin.reflect.KProperty1
+
+fun Map<String, Any>.toR2dbcMagicFilter(): R2dbcMagicFilter {
+  val map: MultiValueMap<String, String> = LinkedMultiValueMap()
+  this.forEach { map.add(it.key, it.value.toString()) }
+  return R2dbcMagicFilter(map)
+}
+
+fun magicFilterOfR2dbc(vararg prm: Pair<String, Any>): R2dbcMagicFilter = prm.toMap().toR2dbcMagicFilter()
+
+fun <T, V> KProperty1<T, V?>.eq(value: Any): Pair<String, Any> = name to value.toString()
+fun <T, V> KProperty1<T, V?>.gt(value: Any): Pair<String, Any> = name + "_gt" to value.toString()
+fun <T, V> KProperty1<T, V?>.ge(value: Any): Pair<String, Any> = name + "_ge" to value.toString()
+fun <T, V> KProperty1<T, V?>.lt(value: Any): Pair<String, Any> = name + "_lt" to value.toString()
+fun <T, V> KProperty1<T, V?>.le(value: Any): Pair<String, Any> = name + "_le" to value.toString()
+fun <T, V> KProperty1<T, V?>.like(value: Any): Pair<String, Any> = name + "_like" to value.toString()
+fun <T, V> KProperty1<T, V?>.likeExp(value: Any): Pair<String, Any> = name + "_like_exp" to value.toString()
+fun <T, V> KProperty1<T, V?>.notLike(value: Any): Pair<String, Any> = name + "_not_like" to value.toString()
+fun <T, V> KProperty1<T, V?>.notLikeExp(value: Any): Pair<String, Any> = name + "_not_like_exp" to value.toString()
+fun <T, V> KProperty1<T, V?>.`in`(value: Any): Pair<String, Any> = name + "_in" to value.toString()
+fun <T, V> KProperty1<T, V?>.notIn(value: Any): Pair<String, Any> = name + "_not_in" to value.toString()
+fun <T, V> KProperty1<T, V?>.isNull(value: Any): Pair<String, Any> = name + "_is_null" to value.toString()
+fun <T, V> KProperty1<T, V?>.isNotNull(value: Any): Pair<String, Any> = name + "_is_not_null" to value.toString()