[path_provider_windows] add getExternalStoragePaths()

[squarebrakets]

This pr allows to get list of drives in a windows system using getExternalStorageDirectories();

List which issues are fixed by this PR. You must list at least one issue. https://github.com/flutter/flutter/issues/151059

Pre-launch Checklist

• [X] I read the Contributor Guide and followed the process outlined there for submitting PRs.
• [X] I read the Tree Hygiene page, which explains my responsibilities.
• [X] I read and followed the relevant style guides and ran the auto-formatter. (Unlike the flutter/flutter repo, the flutter/packages repo does use dart format.)
• [X] I signed the CLA.
• [X] The title of the PR starts with the name of the package surrounded by square brackets, e.g. [shared_preferences]
• [X] I linked to at least one issue that this PR fixes in the description above.
• [X] I updated pubspec.yaml with an appropriate new version according to the pub versioning philosophy, or this PR is exempt from version changes.
• [X] I updated CHANGELOG.md to add a description of the change, following repository CHANGELOG style, or this PR is exempt from CHANGELOG changes.
• [X] I updated/added relevant documentation (doc comments with ///).
• [X] I added new tests to check the change I am making, or this PR is test-exempt.
• [X] All existing and new tests are passing.

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