[#14] add lombok and refactor exceptions. Provide validator.

Signed-off-by: Ori Bruk <o.bruk@yadro.com>

exceptions/src/main/java/info/frostfs/sdk/constants/ErrorConst.java

@@ -0,0 +1,49 @@
+package info.frostfs.sdk.constants;
+
+public class ErrorConst {
+    public static final String OBJECT_IS_NULL = "object must not be null";
+    public static final String INPUT_PARAM_IS_MISSING = "input parameter is not present";
+    public static final String SOME_PARAM_IS_MISSING = "one of the input parameters is not present";
+    public static final String PARAM_IS_MISSING_TEMPLATE = "param %s is not present";
+    public static final String PARAMS_ARE_MISSING_TEMPLATE = "params %s are not present";
+    public static final String INPUT_PARAM_IS_MISSING_TEMPLATE = "%s value is not present";
+
+    public static final String INPUT_PARAM_GREATER_OR_EQUAL_ZERO = "%s must be greater than or equal to zero";
+    public static final String INPUT_PARAM_GREATER_ZERO = "%s must be greater than zero";
+
+    public static final String REQUIRED_FIELD_TEMPLATE = "%s required field";
+
+    public static final String REQUIRED_PROTO_FIELD_TEMPLATE = "the proto message does not contain a field %s";
+    public static final String UNSUPPORTED_PROTO_MESSAGE_TYPE_TEMPLATE = "unsupported proto message type: %s";
+    public static final String PROTO_MESSAGE_IS_EMPTY_TEMPLATE = "proto message %s must not be empty";
+    public static final String UNEXPECTED_MESSAGE_TYPE_TEMPLATE = "unexpected message type, expected %s, actually %s";
+
+    public static final String WIF_IS_INVALID = "WIF is invalid";
+    public static final String UNEXPECTED_STREAM = "unexpected end of stream";
+    public static final String INVALID_HOST_TEMPLATE = "host %s has invalid format. Error: %s";
+    public static final String INVALID_RESPONSE = "invalid response";
+    public static final String VERSION_UNSUPPORTED_TEMPLATE = "frostFS %s is not supported.";
+
+    public static final String UNKNOWN_ENUM_VALUE_TEMPLATE = "unknown %s value: %s";
+
+    public static final String INPUT_PARAM_IS_NOT_SHA256 = "%s must be a sha256 hash";
+    public static final String DECODE_LENGTH_VALUE_TEMPLATE = "decode array length must be >= 4, but %s";
+    public static final String INVALID_BASE58_CHARACTER_TEMPLATE = "invalid character in Base58: 0x%04x";
+    public static final String INVALID_CHECKSUM = "checksum does not match";
+    public static final String WRONG_SIGNATURE_SIZE_TEMPLATE = "wrong signature size. Expected length=%s, actual=%s";
+    public static final String ENCODED_COMPRESSED_PUBLIC_KEY_WRONG_LENGTH_TEMPLATE =
+            "publicKey isn't encoded compressed public key. Expected length=%s, actual=%s";
+    public static final String UNCOMPRESSED_PUBLIC_KEY_WRONG_LENGTH_TEMPLATE =
+            "compress argument isn't uncompressed public key. Expected length=%s, actual=%s";
+    public static final String COMPRESSED_PUBLIC_KEY_WRONG_LENGTH_TEMPLATE =
+            "decompress argument isn't compressed public key. Expected length=%s, actual=%s";
+
+    public static final String WRONG_UUID_SIZE_TEMPLATE = "uuid byte array length must be %s";
+
+
+    public static final String FIELDS_DELIMITER_COMMA = ", ";
+    public static final String FIELDS_DELIMITER_OR = " or ";
+
+    private ErrorConst() {
+    }
+}

exceptions/src/main/java/info/frostfs/sdk/exceptions/ProcessFrostFSException.java

@@ -0,0 +1,11 @@
+package info.frostfs.sdk.exceptions;
+
+public class ProcessFrostFSException extends RuntimeException {
+    public ProcessFrostFSException(String message) {
+        super(message);
+    }
+
+    public ProcessFrostFSException(Throwable cause) {
+        super(cause);
+    }
+}

exceptions/src/main/java/info/frostfs/sdk/exceptions/TimeoutFrostFSException.java

@@ -0,0 +1,6 @@
+package info.frostfs.sdk.exceptions;
+
+public class TimeoutFrostFSException extends RuntimeException {
+    public TimeoutFrostFSException() {
+    }
+}

exceptions/src/main/java/info/frostfs/sdk/exceptions/ValidationFrostFSException.java

@@ -0,0 +1,7 @@
+package info.frostfs.sdk.exceptions;
+
+public class ValidationFrostFSException extends RuntimeException {
+    public ValidationFrostFSException(String message) {
+        super(message);
+    }
+}