Support multiple versions in `bindgen!` (#7172)

This commit fixes a bug in the `bindgen!` macro where when faced with
multiple packages that differ only in version number invalid bindings
were gener

Support multiple versions in `bindgen!` (#7172)

This commit fixes a bug in the `bindgen!` macro where when faced with
multiple packages that differ only in version number invalid bindings
were generated. The fix here is to add version number information to
package module names if necessary in situations such as this. This
required some refactoring internally to have a single source of truth
for what the name of a module should be and avoid having it implicitly
calculated in two locations.

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