Add TemporalFactories

[jodastephen]

Consider adding a class TemporalFactories (name TBD). It would have factory methods for all temporal classes across java.time and ThreeTen-Extra. The crucial difference would be that such a class would be designed for static imports:

public class TemporalFactories {
  public LocalDate date(int,int,int);
  public LocalDate date(int,Month,int);
  public LocalDate date(int,MonthDay);
  public LocalDate date(int,int);
  public LocalDate date(Year,int,int);
  public LocalDate date(Year,Month,int);
  public LocalDate date(Year,MonthDay);
  public LocalDate date(Year,int);
  public LocalDate date(String);  // parse
  // and so on for other types
}
// usage
callMethod(date(2020, 6, 12));

Originally suggested in #155

[raupachz]

That would definitely make some parts of the code I write more concise and less verbose.

Unless anyone objects, I would like to spend some time on this.

[jodastephen]

I'd love to see this - they'll be quite a lot of methods, so I'd suggest simple Javadoc simply repeating the implementation as an @code

[mjustin]

@jodastephen I notice that LocalDate.from(TemporalAccessor temporal) is missing from the list. Would you expect this to be in this class, or for it to be excluded from this class?

public static LocalDate date(TemporalAccessor from)

[jodastephen]

Excluded. Conversion methods should need more care to use than of methods.