Add marker interfaces for problem types

Author: lcobucci

src/Problem/AuthorizationRequired.php

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+<?php
+declare(strict_types=1);
+
+namespace Lcobucci\ErrorHandling\Problem;
+
+use Throwable;
+
+interface AuthorizationRequired extends Throwable
+{
+}

src/Problem/Conflict.php

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+<?php
+declare(strict_types=1);
+
+namespace Lcobucci\ErrorHandling\Problem;
+
+use Throwable;
+
+interface Conflict extends Throwable
+{
+}

src/Problem/Forbidden.php

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+<?php
+declare(strict_types=1);
+
+namespace Lcobucci\ErrorHandling\Problem;
+
+use Throwable;
+
+interface Forbidden extends Throwable
+{
+}

src/Problem/InvalidRequest.php

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+<?php
+declare(strict_types=1);
+
+namespace Lcobucci\ErrorHandling\Problem;
+
+use Throwable;
+
+interface InvalidRequest extends Throwable
+{
+}

src/Problem/ResourceNoLongerAvailable.php

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+<?php
+declare(strict_types=1);
+
+namespace Lcobucci\ErrorHandling\Problem;
+
+use Throwable;
+
+interface ResourceNoLongerAvailable extends Throwable
+{
+}

src/Problem/ResourceNotFound.php

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+<?php
+declare(strict_types=1);
+
+namespace Lcobucci\ErrorHandling\Problem;
+
+use Throwable;
+
+interface ResourceNotFound extends Throwable
+{
+}

src/Problem/ServiceUnavailable.php

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+<?php
+declare(strict_types=1);
+
+namespace Lcobucci\ErrorHandling\Problem;
+
+use Throwable;
+
+interface ServiceUnavailable extends Throwable
+{
+}

src/Problem/UnprocessableRequest.php

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+<?php
+declare(strict_types=1);
+
+namespace Lcobucci\ErrorHandling\Problem;
+
+use Throwable;
+
+interface UnprocessableRequest extends Throwable
+{
+}