Vernier Adoption

### Are there any linked Issues or Pull Requests?

_No response_

### Brief description

Vernier is a more richly featured calliper implementation that timer.
Vernier is available for use but is not used as standard in lfric_apps.

A number of steps are required to enable adoption of Vernier within LFRic:

* [ ] rose-stem configuration of use of timer or Vernier in a single switch
* Query whether this is necessary, should both modes be available via switch, or do we just change the default?
* [ ] enabling the vernier single file output mode by default, and saving the resulting log output into the log directory of the run (so it is not housekept)
* [ ] Adoption of the Vernier post-processing python library, including having this installed and available for use on AzSpice and EX quads
* [ ] a post processing task in the rose-stem, triggered on use of Vernier, which produces an easily readable aggregated output of the vernier rank by ranks data, using a text format consistent with the timer implementation
* [ ] A set of runs, running parallel tests with Vernier and with Timer, that compare results and validate measurement consistency

### Further details of the issue.

_No response_