Handle number overflow during parsing of min/max values

[Robulane]

Sometimes developers put Double.MaxValue or Long.MaxValue asmax values for numbers in json schema, even if their numbers are not expected to be that big/small. As we have already released the library with Decimal type for Max/Min, let's not introduce the breaking change and just fallback to Decimal.Max / Min in case of overflow. This should satisfy almost every scenario. We can revisit this if somebody really needs to have double or long here.

Fixing this exception stacktrace

ExceptionType: System.OverflowException
ExceptionMessage: Value was either too large or too small for a Decimal.
InnerExceptionType:
InnerExceptionMessage:
StackTrace:
at System.Number.ThrowOverflowOrFormatException(ParsingStatus status, TypeCode type)
at System.Decimal.Parse(String s, NumberStyles style, IFormatProvider provider)
at Microsoft.OpenApi.Readers.V2.OpenApiV2Deserializer.<>c.<.cctor>b__83_141(OpenApiSchema o, ParseNode n)
at Microsoft.OpenApi.Readers.ParseNodes.PropertyNode.ParseField[T](T parentInstance, IDictionary2 fixedFields, IDictionary2 patternFields)
at Microsoft.OpenApi.Readers.V2.OpenApiV2Deserializer.LoadSchema(ParseNode node)
at Microsoft.OpenApi.Readers.ParseNodes.MapNode.<>c__DisplayClass6_01.<CreateMap>b__0(KeyValuePair2 n)
at System.Linq.Enumerable.SelectEnumerableIterator2.MoveNext() at System.Linq.Enumerable.ToDictionary[TSource,TKey,TElement](IEnumerable1 source, Func2 keySelector, Func2 elementSelector, IEqualityComparer1 comparer) at System.Linq.Enumerable.ToDictionary[TSource,TKey,TElement](IEnumerable1 source, Func2 keySelector, Func2 elementSelector)
at Microsoft.OpenApi.Readers.V2.OpenApiV2Deserializer.<>c.<.cctor>b__83_158(OpenApiSchema o, ParseNode n)
at Microsoft.OpenApi.Readers.ParseNodes.PropertyNode.ParseField[T](T parentInstance, IDictionary2 fixedFields, IDictionary2 patternFields)
at Microsoft.OpenApi.Readers.V2.OpenApiV2Deserializer.LoadSchema(ParseNode node)
at Microsoft.OpenApi.Readers.V2.OpenApiV2VersionService.LoadElement[T](ParseNode node)
at Microsoft.OpenApi.Readers.ParsingContext.ParseFragment[T](YamlDocument yamlDocument, OpenApiSpecVersion version)
at Microsoft.OpenApi.Readers.OpenApiYamlDocumentReader.ReadFragment[T](YamlDocument input, OpenApiSpecVersion version, OpenApiDiagnostic& diagnostic)
at Microsoft.OpenApi.Readers.OpenApiTextReaderReader.ReadFragment[T](TextReader input, OpenApiSpecVersion version, OpenApiDiagnostic& diagnostic)
at Microsoft.OpenApi.Readers.OpenApiStringReader.ReadFragment[T](String input, OpenApiSpecVersion version, OpenApiDiagnostic& diagnostic)

[Vincent Biret (baywet)]

Thank you for the contribution!