.NET: [Breaking] Move TextSearchProvider and TextSearchProviderOptions to Microsoft.Agents.AI namespace

[Copilot]

Motivation and Context

Relocates TextSearchProvider and TextSearchProviderOptions classes from Microsoft.Agents.AI.Data namespace to Microsoft.Agents.AI namespace for better API organization.

Description

• Namespace change: Both classes now use namespace Microsoft.Agents.AI; instead of namespace Microsoft.Agents.AI.Data;
• File relocation: Moved files from Data/ subdirectory to parent Microsoft.Agents.AI/ directory
• Updated consumers: Removed using Microsoft.Agents.AI.Data; from:
  • AgentJsonUtilities.cs
  • TextSearchProviderTests.cs

Note: Sample files retain the using Microsoft.Agents.AI.Data; statement and will be updated separately.

Before:

using Microsoft.Agents.AI.Data;

var provider = new TextSearchProvider(...);

After:

using Microsoft.Agents.AI;

var provider = new TextSearchProvider(...);

Contribution Checklist

• The code builds clean without any errors or warnings
• The PR follows the Contribution Guidelines
• All unit tests pass, and I have added new tests where possible
• Is this a breaking change? If yes, add "[BREAKING]" prefix to the title of the PR.

Original prompt

Move TextSearchProvider and TextSearchProviderOptions classes to Microsoft.Agents.AI namespace

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[SergeyMenshykh]

@copilot Please revert the exclusion of the AgentWithTextSearchRag project from the solution. The sample will be updated later.

[Copilot]

@copilot Please revert the exclusion of the AgentWithTextSearchRag project from the solution. The sample will be updated later.

Reverted the exclusion of AgentWithTextSearchRag from the solution in commit f2cf48b.