Beefy data structure definition and implementation

src/main/java/com/limechain/beefy/dto/Commitment.java

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+package com.limechain.beefy.dto;
+
+import lombok.Data;
+
+import java.math.BigInteger;
+import java.util.List;
+
+@Data
+public class Commitment {
+    private List<PayloadElement> payload;
+    private BigInteger blockNumber;
+    private BigInteger validatorSetId;
+}

src/main/java/com/limechain/beefy/dto/PayloadElement.java

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+package com.limechain.beefy.dto;
+
+import lombok.Data;
+
+@Data
+public class PayloadElement {
+    private  byte[] payloadId;
+    private  byte[] data;
+}

src/main/java/com/limechain/beefy/dto/SignedCommitment.java

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+package com.limechain.beefy.dto;
+
+import com.limechain.runtime.hostapi.dto.Signature;
+import lombok.Data;
+
+import java.util.List;
+import java.util.Optional;
+
+@Data
+public class SignedCommitment {
+    private Commitment commitment;
+    private List<Optional<Signature>> signature;
+}

src/main/java/com/limechain/beefy/dto/SignedCommitmentWitness.java

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+package com.limechain.beefy.dto;
+
+import com.limechain.runtime.hostapi.dto.Signature;
+import lombok.Data;
+
+import java.util.List;
+
+@Data
+public class SignedCommitmentWitness {
+    private Commitment commitment;
+    private  List<Boolean> signedBy;
+    private Signature signature;
+}

src/main/java/com/limechain/beefy/dto/ValidatorSet.java

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+package com.limechain.beefy.dto;
+
+import io.libp2p.core.crypto.PubKey;
+import lombok.Data;
+
+import java.util.List;
+
+@Data
+public class ValidatorSet {
+    List<PubKey> validators;
+    private  long id;
+}

src/main/java/com/limechain/beefy/dto/VoteMessage.java

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+package com.limechain.beefy.dto;
+
+import com.limechain.runtime.hostapi.dto.Signature;
+import lombok.Data;
+
+import java.math.BigInteger;
+
+@Data
+public class VoteMessage {
+    private Commitment commitment;
+    private BigInteger authorityId;
+    private Signature signature;
+}