Admin: Move benchmark functions to new component "Benchmark" and add separate admin node

[fneumann]

This PR is part of the feature request Unbundling of Admin Permissions

It moves the benchmarking functions from a tab of "General Settings" to a new node "Benchmarking" in the administration menu section "System Settings and Maintenance".

The GUI of "Benchmarking" has three tabs: "View", "Settings" and "Permissions".

• "View" shows the last recorded database queries and has the subtabs "Chronological", "Slowest First", Sorted By SQL" and "Aggregated by Frst Table in SQL".
• "Settings" needs write permission to be shown and has the form to activate a benchmark.
• "Permissions" ist the standard tab for permision settings and needs the "edit_permissions" permission.

The code for benchmarking is moved from the Components "Database" and "SystemFolder" to a new component "Benchmark". The language variables are moved from the module "administration" to a new module "benchmark.

[chfsx]

Thanks a lot, LGTM! Does this new component "benchmark" needs some approval of the JF/PM?

[fneumann]

Thanks @chfsx. I'll clarify this with the PM today. Should we put this new component under the Authority of Database or would you like to get rid of it?

[chfsx]

@fneumann thsnks for asking, you can clone the Database Authorities for the moment 👍

[fneumann]

Thx @chfsx @lscharmer for the reviews. I solved the merge conflict with the previous move of Cron and moved two lang vars from administration to benchmark.