Validate annotation key-value type

As per [document](https://docs.aws.amazon.com/xray/latest/devguide/xray-sdk-python-segment.html) X-Ray SDK accepts key-value pairs with string, number, or Boolean values for annotations. Now, in the case of customer adding key-value pairs other than these 3 supported data types SDK silently accepts other type and fail to add annotations which is undesired behavior. Instead, SDK should throw the error in the case of unaccepted types.

Solution: We probably can add a check to validate if data type is string, number, or Boolean