[package_info_plus] Resolve package name linux and web

[fabiancrx]

Description

package_info_plus for linux and web returns now return the package_name contained in the version.json file (which was introduced in this PR)

See the data returned on both web and linux platforms :

Related Issues

Closes #203

Checklist

Before you create this PR confirm that it meets all requirements listed below by checking the relevant checkboxes ([x]).
This will ensure a smooth and quick review process.

• I read the Contributor Guide and followed the process outlined there for submitting PRs.
• My PR includes unit or integration tests for all changed/updated/fixed behaviors (See Contributor Guide).
• All existing and new tests are passing.
• I updated the version in pubspec.yaml and CHANGELOG.md.
• I updated/added relevant documentation (doc comments with ///).
• The analyzer (flutter analyze) does not report any problems on my PR.
• I read and followed the Flutter Style Guide.
• I am willing to follow-up on review comments in a timely manner.

Breaking Change

Does your PR require plugin users to manually update their apps to accommodate your change?

• Yes, this is a breaking change (please indicate a breaking change in CHANGELOG.md and increment major revision).
• No, this is not a breaking change.

[jpnurmi]

Looking good - just needs a rebase. I merged and published #818 first because it fixed a severe bug.

[fabiancrx]

@jpnurmi rebase finished.

[jpnurmi]

Thanks, LGTM 👍