[Feature request]: Expose CituationUtils class

[xzf0587]

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In the Teams Toolkit, we have a CEA template which overrides the SayCommand to customize the citation content.
The teams ai library exposes a useful citation utility as the following shows.
https://github.com/OfficeDev/teams-toolkit/blob/2113c3332df66d88e8955115ca46c945ccbd637e/templates/ts/custom-copilot-rag-customize/src/app/customSayCommand.ts#L68
We want to migrate this code to dotnet project. It is found that the implementation of CitationUtils in dotnet is an internal class and the project code cannot access to it.
https://github.com/microsoft/teams-ai/blob/main/dotnet/packages/Microsoft.TeamsAI/Microsoft.TeamsAI/Utilities/CitationUtils.cs

Question

Can we expose the CitationUtils class(maybe more utilities class) to library users?

One more question, is there any suggestion for the best practice to customize the citation?
I find that we want to customize the citation content rather override the SayCommand.
If there is hook which we can update the citation before the real SayCommand action (somehow BeforeSayCommand), we do not need to override the SayCommand action.

Code snippets

  // If there are citations, modify the content so that the sources are numbers instead of [doc1], [doc2], etc.
    const contentText = citations.length < 1 ? content : Utilities.formatCitationsResponse(content);

    // If there are citations, filter out the citations unused in content.
    const referencedCitations =
      citations.length > 0 ? Utilities.getUsedCitations(contentText, citations) : undefined;

[aacebo]

we do plan to expose better utilities for creating complex activities such as this, we are working on it actively but unsure when these new changes will be available.