Local strain mappings

[rtlortega]

This is a continuation of the previous pull request. However, I had to start over because my previous repository was outdated compared to the latest changes.

In response to @CunliangGeng 's comments:

• I added tests for each function (see attached screenshots).
• I ran mypy and ruff (screenshots attached). There is one mypy error, but it originates from other files in the repository, not my changes.
• Functions are now listed in alphabetical order.

Overview of Added Functions:

Utils (generating strain_mappings locally):

• create_strain_mappings → Generates a JSON file for NPLinker.
• extract_bgcs_genome_id → Extracts BGCs based on strain_id (reverse of get_bgcs_genome_mapping).
• extract_features_metabolome_id → Extracts features based on strain_id.
• extract_strain_metadata → Retrieves metadata from researcher-provided files.
• merge_bgcs_features → Creates a dictionary mapping features to BGCs.

Antismash Loader:

• get_genome_bgcs_mapping → Reverse function of the existing get_bgcs_mapping.

Final Note:
I strongly suggest keeping updated test data in the latest format within the test folder. This ensures new functions are easier to build and verify against correct data structures and types.