How to handle multi user for the same installation? (Simultaneous query)

[pedrobcst]

Currently, as designed, Xerus can only handle one user for one installation when querying for missing CIFs for a given chemical space.
With the development of the Streamlit beta interface, the possibility of one installation being used by many users will be possible.
In this scenario, Xerus cannot handle concurrent query for different chemical spaces, as it always save and tests the cifs using fixed names.
Change this to support multiquery use by multiple users simultaneously.

Ideas:

• Instead of using a 'predefined' name for each provider as (mp_dump, cod_dump, aflow_dump, etc), we could use instead directly the chemical space name + provider as (Ho-B_mp_dump) etc and the same for queried_cifs folder.
• If above, we have also to change the 'test_cif' to accept the final folder as final destination for final testing.

TODO:

• Change query static folder names ('xx_dump') to a name based on dataset name + chemical space + provider, ie from 'mp_dump' to 'DataSetName_ChemSpace_mp_dump' (or something smaller)
• Change testing cif to accept the final 'dump folder' also from static (queried_cifs) to the same as above
• For the case of multiple user querying overlap space, before adding the CIFs, we should do a check to see if that structure already exist in the database OR we should 'clean up' the database of duplicates after querying (whatever is better, maybe the first option is best)
• Write few tests (not to be used in CI, just to check the if everything works well), emulating multi user usage from with overlapping chemical spaces, identical chemical spaces and non overlappaing chemical spaces

[pedrobcst]

Instead of checking the ID on insertion, I have changed to ensure that "id" (which is related to provider ID, not Mongo unique "_id"), to be unique.
Now, if the collection does not exist, it will be automatically created with the ID ("id") set to unique.
For already existing collections, mgiht have to do this manually.