Change the variable LCAOAlternative to be an option of LCAOStart
Description
Following the discussions in #1100, the variable LCAOAlternative is now converted to be an option of LCAOStart. This will facilitate the transition to better defaults as discussed in #1100.
News snippet
The variable LCAOAlternative is now converted to be an option of LCAOStart (lcao_states_batch).
Checklist
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I have checked that my code follows the Octopus coding standards -
I have added tests for all the new features added in this request.