Follow [extras] in install-minimums

[bollwyvl]

Problem

Some packages put rather important functionality behind [extras], and these are not followed up by install-minimums, which can leave a broken test state if not specified directly.

Proposed Solution

• figure out how to make the spec building discover these when solving
• add something similar to test-sdist's package_spec

Alternatives

• document options for install-minimums users
  • avoid using [extras] 😝
  • re-capture the upstream's [extra] as another extra

Additional context

• example log for a PR that exists mostly to opt in to jsonschema[format-nongpl].

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[bollwyvl]

In my particular case, the upstream had changed the name of the extra from [format_nongpl] to [format-nongpl], but I did find it worked after re-installing manually after the install-minimal action.