Add: Use a 3 arg iso_time for GET iterators

[mattmundell]

What

Use a three argument version of pl/pgsql function iso_time to speed up GET iterators.

Why

Trying to speed up SecInfo pages, when paging to the end.

This PR takes the CPEs from 9s to 7s, for example, so probably need something better.

References

https://www.postgresql.org/docs/current/queries-limit.html 7.6 LIMIT and OFFSET:
The rows skipped by an OFFSET clause still have to be computed inside the server; therefore a large OFFSET might be inefficient.

[github-actions]

Conventional Commits Report

Type	Number
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[mattmundell]

Closing because /pull/2112 removes the use of iso_time entirely for these cases.