feat(package_info_plus): Added toMap method

[mcorbelli]

Description

This PR adds a toMap() function to the PackageInfo class in the package_info_plus plugin. Previously, this functionality was missing. The toMap() function returns a map representation of the PackageInfo instance. Notably, the buildSignature and installerStore fields are included in the map only if they are non-null and non-empty. This change ensures that the returned map only contains meaningful and useful data.

Checklist

• I read the Contributor Guide and followed the process outlined there for submitting PRs.
• I titled the PR using Conventional Commits.
• I did not modify the CHANGELOG.md nor the plugin version in pubspec.yaml files.
• All existing and new tests are passing.
• The analyzer (flutter analyze) does not report any problems on my PR.

Breaking Change

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

• Yes, this is a breaking change.
• No, this is not a breaking change.

[nohli]

While I like it, we deprecated toMap() from device_info_plus last year.
#950 (comment)
#949 (comment)
#1142
#1292

[mcorbelli]

I see the problem, can I create a data getter that retrieves data from the toMap as done for device_info_plus? @nohli

[nohli]

Thanks for the change. Makes sense to me, since we have it device_info_plus, too.

Left a code suggestion.

[nohli]

Great, I like it.

Would you mind adding tests? Can set the data with setMockInitialValues and then expect the correct map (also with buildSignature and installerStore being empty/null)?

dart format -l 80 . can fix the format issue

[nohli]

LGTM!