[#30] Client: Add object model for Rules

Signed-off-by: Pavel Gross <p.gross@yadro.com>

src/FrostFS.SDK.Client/ApeRules/Condition.cs

@@ -0,0 +1,43 @@
+namespace FrostFS.SDK.Client;
+
+public struct Condition : System.IEquatable<Condition>
+{
+    public ConditionType Op { get; set; }
+
+    public ConditionKindType Kind { get; set; }
+
+    public string? Key { get; set; }
+
+    public string? Value { get; set; }
+
+    public override bool Equals(object obj)
+    {
+         if (obj == null || obj is not Condition)
+            return false;
+
+        return Equals((Condition)obj);
+    }
+
+    public override readonly int GetHashCode()
+    {
+        return Op.GetHashCode()
+            ^ Kind.GetHashCode()
+            ^ (Key != null ? Key.GetHashCode() : 0)
+            ^ (Value != null ? Value.GetHashCode() : 0);
+    }
+
+    public static bool operator ==(Condition left, Condition right)
+    {
+        return left.Equals(right);
+    }
+
+    public static bool operator !=(Condition left, Condition right)
+    {
+        return !(left == right);
+    }
+
+    public readonly bool Equals(Condition other)
+    {
+        return this.GetHashCode().Equals(other.GetHashCode());
+    }
+}