refactor: normalize pnpm lockfile data in parser

[jbedard]

This way the data is standardized to a format for rules_js at parse time instead of elsewhere throughout the code.

Today the lockfile parsing normalizes to a version similar to pnpm lock v5, then _gather_package_info normalizes that a bit to a more rules_js specific format. The idea of this PR is to directly convert to that rules_js format as part of parsing, instead of pnpm vX => pnpm v5 => rules_js (where X = 5,6,9) we will have pnpm vX => rules_js and ideally have less code...

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Changes are visible to end-users: no

Test plan

• Covered by existing test cases

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[gregmagolan]

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