Enable item renaming and add tests for ApplicationDataStorageHelper

[shweaver-MSFT]

Fixes

PR Type

What kind of change does this PR introduce?

• Bugfix
• Feature

What is the current behavior?

There is currently no methods for renaming items via the IFileStorageHelper interface.

Also, the ApplicationDataStorageHelper needs more tests to validate that the file storage functionality is working as expected.

What is the new behavior?

To support renaming items, I've added a new method IFileStorageHelper.TryRenameItemAsync.

In addition, I've also updated the IFileStorageHelper.DeleteItemAsync method to TryDeleteItemAsync to match the convention. It seems reasonable to expect that the file intended for deletion does not already exist, so the consumer should be able to handle this gracefully, without exceptions.

Lastly, while adding tests for ApplicationDataStorageHelper I discovered that it doesn't handle items in sub-folders very well. So I've made some fixes there as well to support CRUD operations with files/folders in sub-directories.

PR Checklist

Please check if your PR fulfills the following requirements:

• Tested code with current supported SDKs
• Pull Request has been submitted to the documentation repository instructions. Link:
• Sample in sample app has been added / updated (for bug fixes / features)
  • Icon has been created (if new sample) following the Thumbnail Style Guide and templates
• New major technical changes in the toolkit have or will be added to the Wiki e.g. build changes, source generators, testing infrastructure, sample creation changes, etc...
• Tests for the changes have been added (for bug fixes / features) (if applicable)
• Header has been added to all new source files (run build/UpdateHeaders.bat)
• Contains NO breaking changes

Other information

[ghost]

Thanks shweaver-MSFT for opening a Pull Request! The reviewers will test the PR and highlight if there is any conflict or changes required. If the PR is approved we will proceed to merge the pull request 🙌

[ghost]

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