fix(core): preserve strict in FunctionTool component config

[yc2bgr8 (yc2bgr8)]

Why are these changes needed?

FunctionTool(strict=True) currently loses its strict setting when it is serialized with dump_component() and restored with load_component(). This silently changes the generated tool schema to strict=False, even though strict tools are required when they are used with structured output.

This change persists strict in the component configuration and passes it back into the restored tool. The config field defaults to False so component configs produced by earlier AutoGen versions remain loadable with their existing behavior.

Regression coverage verifies both the strict=True round trip and the legacy-config fallback. Before the fix, the new test failed because the dumped config had no strict key. Local validation completed with 21 component-config tests and all 227 autogen-core tests passing, plus Ruff, Mypy, and Pyright.

Related issue number

Closes #8283

Checks

• I've included any doc changes needed for https://microsoft.github.io/autogen/. No documentation changes are needed because this restores the existing strict constructor behavior across component serialization.
• I've added tests (if relevant) corresponding to the changes introduced in this PR.
• I've made sure all auto checks have passed. Local package checks pass; GitHub checks will run after submission.

[yc2bgr8 (yc2bgr8)]

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