Aleksander Alekseev ab71c4a1c1 Mark time_bucket_ng() as IMMUTABLE
This patch marks time_bucket_ng() as IMMUTABLE. Two exceptions are:

- time_bucket_ng(interval, timestamptz) timestamptz
- time_bucket_ng(interval, timestamptz, timestamptz) timestamptz

... due to their implementation, see the comments. These two overloaded
versions were introduced only for backward compatibility with time_bucket()
and are not needed for building continuous aggregates.
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