refactor: create antismash downloader module and move there inherent code

[gcroci2]

• I moved popd antismash download and extraction related stuff to nplinker/pairedomics/
• I moved the code regarding antismash data download and extraction from pairedomics/downloader.py to genomics/antismash/antismash_downloader.py.
• I refactored old function download_antismash_data, which now is deprecated, and created a new one download_and_extract_antismash_data, which takes as input a single item id to be used to retrieve Antismash data. In the refactored downloader for PoDP it will be inserted in a for loop to iterate over all the items available. The downloader module will be refactored in a different PR (see issue Refactor Downloader class to have a specific PoDP downloader #121).
• I moved antismash tests to tests/antismash folder, calling them test_antismash_downloader.py and test_antismash_loader.py.
• I've run prospector and static typing checks, and reordered imports on the new antismash files
• I've added a proper docstring to the antismash downloader file

One test is still failing:

============================================================================= short test summary info =============================================================================
FAILED tests/genomics/test_genomics.py::test_map_strain_to_bgc_error - AssertionError: assert 'Not found BGC id BGC0000003 in BGC-geonme mappings.' in 'Not found BGC id BGC0000003 in BGC-genome mappings.'

[CunliangGeng]

Thanks, see my comments below.

[CunliangGeng]

Great! A few more comments, almost there :-)

[CunliangGeng]

Thanks! It's almost there, 4 more comments to go

[CunliangGeng]

Thanks for your effort! PR approved 🎉
The test error you mentioned is fine, it's already fixed in dev branch.
Please Squash and merge the PR, then you can close it.