[Feature] Support aggregate function state_agg

[ZuoTiJia]

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The duration_in function can be used to specify the time interval for the aggregation result of state_agg.

create table if not exists states(state STRING);
insert into states values
('2020-01-01 10:00:00', 'starting'),
('2020-01-01 10:30:00', 'running'),
('2020-01-03 16:00:00', 'error'),
('2020-01-03 18:30:00', 'starting'),
('2020-01-03 19:30:00', 'running'),
('2020-01-05 12:00:00', 'stopping');

select duration_in(state_agg(time, state), 'running') from states;
-- 0 years 0 mons 3 days 22 hours 0 mins 0.000000000 secs

select duration_in(state_agg(time, state), 'running', Timestamp '2020-01-01 11:00:00');
-- 0 years 0 mons 3 days 21 hours 30 mins 0.000000000 secs