Handling of integer number types with `int16` format.

[andrueastman]

As a follow up to microsoft/OpenAPI.NET.OData#593

The integer types were replaced in the openapi description with number types which presented the a inconsistency in the generation. Due to the case at the line below.

https://github.com/microsoft/kiota/blob/a14fb8130851192316238393e4958844069967b8/src/Kiota.Builder/KiotaBuilder.cs#L1159C19-L1159C26

Properties with the type as integer and format as int16 would be projected as type integer in the codeDom.

However changing the type to integer results in the type being projected as double as opposed to integer before as there is no case to handle the integer with int16 format.