FLake LFRic infrastructure

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

Following the release of JULES vn8.2, this work now requires a linked JULES ticket to remove l_flake_model from lfric/check_unavailable_options_mod.F90 (https://github.com/MetOffice/jules/pull/39).

### Brief description

This issue is the git equivalent of https://code.metoffice.gov.uk/trac/lfric_apps/ticket/697.

In order to run the FLake model in LFRic, the following infrastructure needs to be added:
- FLake related namelist options.
- Infrastructure to initialise FLake prognostic fields and read the lake depth ancillary file.
- Passing FLake values between LFRic and JULES surf_couple subroutines.
- Infrastructure to output lake related fields.

### Further details of the issue.

_No response_