feat: implement new core method get_queryables

[dalpasso]

Implements a new core method def get_queryables(provider=None, product_type=None) -> List[str]:

• If no provider and no product_type are passed, then returns default search method queryable parameters: ["productType", "start", "end", "geom", "locations", "id"]
• If a provider is passed (but no product_type), then returns its queryable parameters from provider's config
• If a product_type is passed (but no provider), then return the intersection of the queryables of all the providers supporting it
• If both a product_type and a provider are passed, then returns the queryable parameters from provider's config and the queryable parameters for that product type

The following exceptions are raised:

• UnsupportedProvider() if the given provider is not found
• UnsupportedProductType() if the given product_type is not found

[github-actions]

Test Results

       4 files  ±0         4 suites  ±0   3m 28s ⏱️ +4s
   434 tests +1     431 ✔️ +1    3 💤 ±0  0 ❌ ±0 
1 736 runs  +4  1 660 ✔️ +4  76 💤 ±0  0 ❌ ±0 

Results for commit a287c9f. ± Comparison against base commit b6dd367.

♻️ This comment has been updated with latest results.

[github-actions]

Code Coverage (Ubuntu)

File	Coverage
All files	82%	✅

Minimum allowed coverage is 70%

Generated by 🐒 cobertura-action against a287c9f

[github-actions]

Code Coverage (Windows)

File	Coverage
All files	76%	✅

Minimum allowed coverage is 70%

Generated by 🐒 cobertura-action against a287c9f

[sbrunato]

• if given provider is not found, please raise UnsupportedProvider()
• if given product_type is not found, please raise UnsupportedProductType()
• if product type is given, but no provider, only return preferred provider queryables instead of the union of all possibles

[dalpasso]

Changed the implementation:

• added a default list of queryables to all the providers
• when product_type is given, but no provider, then return the intersection of the queryables of all the providers supporting it