conflicts resolvers customization

bot/src/main/kotlin/dev/inmo/plagubot/OnStartContextsConflictResolver.kt

@@ -0,0 +1,16 @@
+package dev.inmo.plagubot
+
+import dev.inmo.micro_utils.fsm.common.State
+
+fun interface OnStartContextsConflictResolver {
+    /**
+     * @param old Old state which is currently placed on the [State.context]
+     * @param new New state pretend to replace [old] one
+     * @return Should return:
+     *
+     * * Null in case when current realization unable to resolve conflict
+     * * False when current realization knows that [new] [State] must **not** replace [old] one
+     * * True when current realization knows that [new] [State] must replace [old] one
+     */
+    suspend operator fun invoke(old: State, new: State): Boolean?
+}