Allow use of `StdDateFormat.setLenient()`

[raj-ghodke]

ObjectMapper uses the StdDateFormat for date serialization. Jackson date parsing is lenient by default, so 2015-01-32 gets parsed as 2015-02-01. Jackson’s StdDateParser is matching default behavior of DateParser.

StdDateParser wasn’t really designed for extension to just enable strict date parsing. If it were, we could just call objectMapper.setDateFormat(new StdDateFormat().setLenient(false)). But StdDateFomrat doesn't support setting lenient to false. And i.e. the reason date like 2015-01-32 gets parsed as 2015-02-01 ad Jackson date parsing is lenient by defualt.

Can StdDateFormat can be enhanced to support to non lenient date parsing?

[cowtowncoder]

Was about to comment that setLenient() exists from the base class but then realized that while true, that will not have an effect on DateFormat instances that are actually used.

So: it should be possible to support non-leniency setting. I can not change setLenient to be chainable (non-covariant change is illegal I think), but it could be changed to pass setting to contained format instances.