Add new functionality

[anushkavidanage]

Pull Request Details

What issue does this PR address

• Add extra functionality to solidpod package. To see all added functionality check the issue SOLID POD: Add extra functionality related to managing external POD resources #274

• Link to associated issue: SOLID POD: Add extra functionality related to managing external POD resources #274

• Noe: To check this PR, please use Av/113 migrate to solidpod notepod#117

Checklist

Complete the check-list below to ensure your branch is ready for PR.

Flutter Style Guide: https://survivor.togaware.com/gnulinux/flutter-style.html

• Screenshots included in linked issue
• Changes adhere to the team style and coding guideline
• No confidential information
• No duplicated content
• No lint check errors related to your changes (make prep or flutter analyze lib)
• Pre-exisiting lint errors noted: [HERE]
• Tested on at least one device
  • Android Phone
  • Android Emulator
  • Chrome on Android
  • Chrome
  • iOS
  • Linux
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• Added 2 reviewers (or 1 for private repositories then they add another)

Finalising

Once PR discussion is complete and 2 reviewers have approved:

• Merge dev into the branch
• Resolve any conflicts
• Add one line summary into CHANGELOG.md
• Bump appropriate version number in pubspec.yaml
• Push to git repository and review
• Merge PR into dev

[cdawei]

Thanks @anushkavidanage.

[atangster]

For methods that now take ownerWebID and removerWebId as required positional parameters:

1. Will callers that still use the old signatures fail to compile?
2. Could we potentially make these new parameters optional named arguments (with sensible defaults) to preserve source compatibility?

[anushkavidanage]

Thanks Ashley, this, unfortunately, cannot be made optional. The old function did not have the functionality to set permission when the permission giver and the owner are two different people. So adding that functionality means we have to stop using the old version.