Added error types.

Author: simphotonics

lib/src/type/decoder_not_found.dart

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+import 'package:exception_templates/exception_templates.dart';
+
+/// This type of error is thrown if an attempt at reading a `DartObject`
+/// failed because a suitable `Decoder` is not registered with `GenericReader`.
+abstract class DecoderNotFound extends ErrorType {}

lib/src/type/invalid_field_name.dart

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+import 'package:exception_templates/exception_templates.dart';
+
+/// This type of error is thrown if an invalid
+/// field name is provided when reading a constant value.
+abstract class InvalidFieldName extends ErrorType {}

lib/src/type/invalid_type_argument.dart

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+import 'package:exception_templates/exception_templates.dart';
+
+/// This type of error is thrown if an invalid type argument
+/// is provided for a generic type.
+abstract class InvalidTypeArgument extends ErrorType {}