Date nanos support for RATE (elastic#138954)

* Adding support for date nanos/millis on rate,irate.

* fxip

* datenanos checks for irate

* [CI] Auto commit changes from spotless

* fixup for rate

* fixup

* fix index naming

* fxup

* Seconds added in range limits for rate (nowhere else)

* Fix small bug on TSAgg operator. Add date nanos support to rate for timeseries

* fix spotles

* aigu

* aigu

* fxtestr

* fixtest?

* oops capability

* fixup?

* found bugs, fixed.

* fxtest

* fixup tests

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Co-authored-by: elasticsearchmachine <infra-root+elasticsearchmachine@elastic.co>

Author: pabloem