Ruby version Timestamp.from_time feels like there should be a class method

[tmtrademarked]

What language does this apply to?
Generated Ruby code

Describe the problem you are trying to solve.
Working with timestamps is somewhat awkward. To create a protobuf timestamp from Ruby time objects, you have to do the following:

ts = Google::Protobuf::Timestamp.new
ts.from_time(Time.now) # returns the nanos rather than the Timestamp itself.

Describe the solution you'd like
It seems like it would be easier if the Timestamp class just defined a class method as well as an instance method. Something like:

def self.from_time(time)
  return if time.nil?
  new(seconds: time.seconds, nanos: time.nsec)
end

This would allow developers to create timestamp objects in a slightly more natural syntax:

ts = Google::Protobuf::Timestamp.from_time(Time.now)

[deannagarcia]

This functionality was added in #8562, so newer forms of protobuf should have it!