fix(battery_plus): Add iOS Privacy Info

[miquelbeltran]

Description

• Add PrivacyInfo to podspec of Battery Plus

Related Issues

• Part of iOS privacy manifest required for several plugins #2447

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 (please indicate that with a ! in the title as explained in Conventional Commits).
• No, this is not a breaking change.

[miquelbeltran]

Code compiles and runs as it did before. I followed the PR from the Flutter team as example and added it to the pod file: flutter/packages#5846

I am not sure if there is anything else I can do to verify this is all good.

[miquelbeltran]

cc. @stuartmorgan

[vbuberen]

Looks good to me even though I don't like that such solution isn't communicated publicly, but via some correspondence as it is mentioned here: flutter/flutter#131940 (comment)

Let's mark it not as chore because I believe such changes should be included in release notes generated by Melos.

[miquelbeltran]

Let's mark it not as chore because I believe such changes should be included in release notes generated by Melos.

Good catch!

[miquelbeltran]

Merged, I will be preparing the rest