Refactor and rename types and properties for consistency and clarity

[ShivangiReja]

Summary of Changes

This PR renames the following types and properties for consistency and clarity:

• Types:

  • OpenAIFileInfo → OpenAIFile
  • OpenAIFileInfoCollection → OpenAIFileCollection
  • OpenAIModelInfo → OpenAIModel
  • OpenAIModelInfoCollection → OpenAIModelCollection
  • Embedding → OpenAIEmbedding
  • EmbeddingCollection → OpenAIEmbeddingCollection

• Properties and Methods:

  • ImageUrl → ImageUri and method FromImageUrl → FromImageUri in MessageContent
  • ParallelToolCallsEnabled → AllowParallelToolCalls in RunCreationOptions, ThreadRun, and ChatCompletionOptions
  • PromptTokens → InputTokenCount, CompletionTokens → OutputTokenCount, and TotalTokens → TotalTokenCount in RunTokenUsage
  • InputTokens → InputTokenCount and TotalTokens → TotalTokenCount in EmbeddingTokenUsage

This PR also refactors the ModerationResult type to consolidate category-specific flags and scores into individual ModerationCategory properties, each containing Flagged and Score properties:

public class ModerationResult {
    public bool Flagged { get; }
    public ModerationCategory Harassment { get; }
    public ModerationCategory HarassmentThreatening { get; }
    public ModerationCategory Hate { get; }
    public ModerationCategory HateThreatening { get; }
    public ModerationCategory SelfHarm { get; }
    public ModerationCategory SelfHarmInstructions { get; }
    public ModerationCategory SelfHarmIntent { get; }
    public ModerationCategory Sexual { get; }
    public ModerationCategory SexualMinors { get; }
    public ModerationCategory Violence { get; }
    public ModerationCategory ViolenceGraphic { get; }
}

public class ModerationCategory {
    public bool Flagged { get; }
    public float Score { get; }
}

Additionally, this PR includes smoke tests for the ModerationResult type.