search by import name

[toejough]

What's the problem this feature will solve?
I can't search pypi for what distribution package provides a particular import package.

Describe the solution you'd like
I'd like an API to be able to search based on import name.

Additional context
I have three concrete use-cases in mind:

• I'd like to easily find what distribution package provides a particular import package. For example, if I want to find out what package I get bpdb from, I have to do a google search and dig around, because that's exposed by bpython, but the only result when searching pypi is pytest-bpdb. Or I could search all of my projects and find the last place I used this package, then look at their package setups and try to divine which distribution package it came from.
• I'd like to be able to see what distribution packages implement the same import package, or forks of it. My prime example is pillow, which you can drop-in for PIL. Searching for PIL doesn't even result in pillow, though. That's really unfortunate, because pillow is a much better, much more recently maintained fork.
• This one is perhaps overly specific, but: I'd like to be able to create a tool that will automatically (or semi-automatically) add the proper config to setup.py (or pyproject.toml (or requirements.txt)) necessary to actually install the packages that provide the imports found in a package I'm editing. I can presently scan a project for imports and identify when an import package isn't importable in the current venv, but I have no way to even suggest to the developer what distribution package they should install. The current manual process described in the first bullet is the worst: tedious manually, and near impossible to automate.

I suppose I've gotten by (and so has everyone else!?) without this ability for a long time, but when I went looking for it, I thought surely I'd find it. I'm still halfway thinking I must be missing something. If I am, I hope someone will point me in the right direction. If I'm not, I hope this feature sounds sensible/useful enough to implement!

Finally, I'm aware that there are limited devs with limited time working on the warehouse. I already get so much from this project/site, and most of the time I just take it for granted. Thank you for this resource and the work being done on it!