add custom exceptions

src/Exceptions/FailedToEncodeException.php

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+<?php
+
+declare(strict_types=1);
+
+namespace Luminarix\JSONL\Exceptions;
+
+use Exception;
+
+/**
+ * The exception that is thrown when an object cannot be encoded to a JSONL row.
+ */
+class FailedToEncodeException extends Exception
+{
+}

src/Exceptions/FailedToOpenFileException.php

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+<?php
+
+declare(strict_types=1);
+
+namespace Luminarix\JSONL\Exceptions;
+
+use Exception;
+
+/**
+ * The exception that is thrown when a file cannot be opened.
+ */
+class FailedToOpenFileException extends Exception
+{
+}

src/Exceptions/FailedToWriteFileException.php

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+<?php
+
+declare(strict_types=1);
+
+namespace Luminarix\JSONL\Exceptions;
+
+use Exception;
+
+/**
+ * The exception that is thrown when a file cannot be written.
+ */
+class FailedToWriteFileException extends Exception
+{
+}

src/Exceptions/InvalidDtoClassException.php

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+<?php
+
+declare(strict_types=1);
+
+namespace Luminarix\JSONL\Exceptions;
+
+use Exception;
+
+/**
+ * The exception that is thrown when a DTO class is invalid.
+ */
+class InvalidDtoClassException extends Exception
+{
+}

src/Exceptions/InvalidRowException.php

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+<?php
+
+declare(strict_types=1);
+
+namespace Luminarix\JSONL\Exceptions;
+
+use Exception;
+
+/**
+ * The exception that is thrown when a JSONL row is invalid.
+ */
+class InvalidRowException extends Exception
+{
+}