Fix Microsoft.Extensions.AI wrapper encoding of inline data when mapping to DataContent

[PederHP]

Microsoft.Extensions.AI wrapper double-encoded inline data when mapping to DataContent.

[gemini-code-assist[bot]]

Summary of Changes

Hello @PederHP, I'm Gemini Code Assist[^1]! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request addresses a critical bug in the Microsoft.Extensions.AI wrapper that caused inline data to be incorrectly double-encoded when being processed and mapped to DataContent. By changing the data conversion method from a UTF-8 byte conversion to a Base64 string decoding, the PR ensures that inline data is handled correctly, preventing data corruption and maintaining the integrity of content within the AI wrapper.

Highlights

• Data Encoding Fix: Resolved an issue where inline data within the Microsoft.Extensions.AI wrapper was being double-encoded when mapped to DataContent.
• Decoding Mechanism Update: The conversion for InlineData has been updated from Encoding.UTF8.GetBytes to Convert.FromBase64String, ensuring proper decoding of Base64-encoded data.
• Code Formatting: A minor formatting adjustment was made to remove an unnecessary newline character at the end of the AbstractionMapper.cs file.

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[jochenkirstaetter]

Hi @PederHP

Another great catch. Thanks. It's currently conflicting with the current code base from another PR which I'm going to resolve.

Cheers