Define conformer_sp_level

[JintaoWu98]

1. We can now calculate the sp value after the conformer job by defining the level of theory in conformer_sp_level.
2. All the conformer xyzs from the conformer job will be processed here.
3. Save the conformers_after_optimization.txt using the updated level of theory and energies specified in conformer_sp_level, if it is defined.

[codecov]

Codecov Report

Attention: Patch coverage is 37.14286% with 22 lines in your changes missing coverage. Please review.

Project coverage is 74.05%. Comparing base (fb16f4a) to head (0577e94).

Files with missing lines	Patch %	Lines
arc/scheduler.py	23.52%	13 Missing ⚠️
arc/main.py	50.00%	4 Missing and 3 partials ⚠️
arc/plotter.py	33.33%	1 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #766      +/-   ##
==========================================
- Coverage   74.09%   74.05%   -0.04%     
==========================================
  Files         101      101              
  Lines       28005    28025      +20     
  Branches     5860     5867       +7     
==========================================
+ Hits        20749    20755       +6     
- Misses       5787     5799      +12     
- Partials     1469     1471       +2     

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