fix(functions): cloud functions results only converted top-level maps

[Lyokone]

Description

Cloud Functions method-channel results only converted top-level maps to Map<String, dynamic>, leaving maps nested inside lists with platform-channel key types. This recursively converts nested lists and maps for callable and streaming results.

Related Issues

• Fixes cloud_functions_platform_interface: Incorrect Type Handling for Cloud Functions Results in Dart #13136

Checklist

• I read the Contributor Guide and followed the process outlined there for submitting PRs.
• My PR includes unit or integration tests for all changed/updated/fixed behaviors (See Contributor Guide).
• All existing and new tests are passing.
• I updated/added relevant documentation (doc comments with ///).
• The analyzer (melos run analyze) does not report any problems on my PR.
• I read and followed the Flutter Style Guide.
• I signed the CLA.
• I am willing to follow-up on review comments in a timely manner.

Breaking Change

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

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