[OLINGO-1501] Fix error when OData client receives EdmDateTime or EdmDateTimeOffset values with precision greater than milliseconds

[nmiguezg]

When the client library reads a query payload in Atom format containing values of type EdmDateTime or EdmDateTimeOffset with a precision greater than milliseconds, it throws an EdmSimpleTimeException, causing the entire query to fail.

According to the OData 2.0 standard specification (OData 2.0 Overview, section 6. Primitive Data Types), literals of type EdmDateTime and EdmDateTimeOffset support up to seven decimal places of precision:

datetime'yyyy-mm-ddThh:mm[:ss[.fffffff]]' NOTE: Spaces are not allowed between datetime and quoted portion. datetime is case-insensitive

datetimeoffset'' dateTimeOffsetLiteral = Defined by the lexical representation for datetime (including timezone offset) at https://www.w3.org/TR/xmlschema-2

So, here it is fixed by changing both date types default type from java.util.Calendar to java.sql.Timestamp (as it's also the default type in the olingo-odata4 library).