carthage-software / cel-php / 28811133299

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feat: implement timestamp and duration arithmetic

Add the six missing +/- overloads: timestamp+/-duration, duration+duration, duration-duration, duration+timestamp, and timestamp-timestamp (yielding a duration). Timestamp results are bounded by TimestampRange; duration results by a new DurationRange whose int64-nanosecond bound matches cel-go, so an out-of-range result errors rather than silently wrapping.

Signed-off-by: azjezz <azjezz@protonmail.com>

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