Fix missing tool support in Ollama streaming client

[MHchangjun]

Motivation and Context

The streaming Ollama client was not sending the tools parameter, so tool calls could never be triggered in streaming mode.
This PR adds the missing tools field for consistency with the non-streaming path and to support models that can use tools.

Breaking Changes

None

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Type of the changes

• New feature (non-breaking change which adds functionality)
• Bug fix (non-breaking change which fixes an issue)
• Breaking change (fix or feature that would cause existing functionality to change)
• Documentation update
• Tests improvement
• Refactoring

Checklist

• The pull request has a description of the proposed change
• I read the Contributing Guidelines before opening the pull request
• The pull request uses develop as the base branch
• Tests for the changes have been added
• All new and existing tests passed

Additional steps for pull requests adding a new feature

• An issue describing the proposed change exists
• The pull request includes a link to the issue
• The change was discussed and approved in the issue
• Docs have been added / updated

[kpavlov]

Thanks, @MHchangjun! We also a test.