Tidy lobster workflow

[utf]

I refactored some parts of the lobster workflow to make it cleaner.

1. Renamed additional_static... to preconverge_static... so that it is consistent throughout all parts of the code.
2. Renamed bulk_relax to just relax because bulk is only really needed when you're doing defects/strains etc.
3. Rewrote the delete wavecar functionality as it was wrapping delete_files in a job unnecessarily. There was no need to do the replace at this bit of the code as you were already in a job.
4. Enable changing the lobster run settings.
5. Changed the additional_fields option to be consistent to with how additional fields is used in the other schemas. This is mainly a way to store additional information in the schema. I added a new option store_lso_dos for specific storing of the DOS as it seemed that this was the only additional file supported.
6. Moved some code around in the schema file. Doing this I realised the code would break if the following condition failed:
   icohplist_path.exists() and cohpcar_path.exists() and charge_path.exists() as struct and describe wouldn't be defined.
7. Some other minor docstring and code optimisations.

@JaGeo please could you have a look over and let me know if this is all ok?

[codecov]

Codecov Report

Merging #260 (bf5dbf1) into main (4668fc3) will increase coverage by 0.51%.
The diff coverage is 82.31%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #260      +/-   ##
==========================================
+ Coverage   76.38%   76.90%   +0.51%     
==========================================
  Files          62       62              
  Lines        5379     5317      -62     
  Branches      773      755      -18     
==========================================
- Hits         4109     4089      -20     
+ Misses       1053     1020      -33     
+ Partials      217      208       -9     

Impacted Files	Coverage Δ
src/atomate2/lobster/schemas.py	86.26% <78.21%> (+7.44%)	⬆️
src/atomate2/vasp/jobs/lobster.py	93.54% <84.61%> (+8.76%)	⬆️
src/atomate2/vasp/flows/lobster.py	94.44% <93.10%> (+15.41%)	⬆️
src/atomate2/lobster/jobs.py	94.11% <100.00%> (-0.33%)	⬇️
src/atomate2/lobster/run.py	55.55% <100.00%> (ø)

[utf]

Ok, I made that change. I also renamed delete_all_wavecars to delete_wavecars for brevity.