This reworks the new `Pypi` JSON API implementation to use
`Json::find_versions` in `Pypi::find_versions`, borrowing some of the
approach from the `Crate` strategy.
Besides that, this pares down the fields in the
`::generate_input_values` return hash to only `:url`, as we're not
using a generated regex to match version information in this setup.
This adds a `provided_content` parameter to `::find_versions` as part
of this process and I will expand the `Pypi` tests to increase
coverage (like the `Crates` tests) in a later PR. 75% of `Pypi` checks
are failing at the moment (with some returning inaccurate version
information), so the current priority is getting this fix merged in
the short-term.
livecheck is returning an `Unable to get versions` error for the
`ansible-lint`, `aws-sam-cli`, and `pyqt-builder` formulae. These use
the `Pypi` strategy without a `livecheck` block, so they use the
generated regex from the strategy. The `Pypi` strategy matches the
version from the tarball link on the pypi.org package page but this
fails for these packages because the formula's `stable` tarball uses
hyphens in the filename (e.g., `ansible-lint-...`) but the current
tarball filename uses underscores (e.g., `ansible_lint-...`).
This addresses the issue by updating the strategy regex to replace
[escaped] `-` or `_` characters in the package name with `[_-]`, so
the regex will match regardless of the delimiter used in the formula
filename.
