Add surrogate free indexed strategies

[vreshniak]

Add Indexed Strategies Support and Improve Strategy Handling

Summary

This PR introduces indexed strategies (surrogate-free sampling methods) and refactors strategy handling throughout the DIAL service.

Features

Indexed Strategies

Adds new surrogate-free sampling strategies that don't require model training:

• center: Sample at domain center point
• corners: Sample at domain corner points
• grid: Uniform grid-based sampling
• chebyshev: Chebyshev node-based sampling
• latin_hypercube: Latin hypercube design sampling

New Examples

• Added 2d_rosenbrock_client_with_strategies.py demonstrating available strategies

Changes Overview

Files Modified

File	Changes
src/dial_service/utilities/strategies.py	Core indexed strategies implementation
src/dial_dataclass/dial_dataclass.py	Updated strategy parameter definitions
src/dial_service/dial_service.py	Service-level strategy validation
src/dial_service/core.py	Strategy execution logic
scripts/2d_rosenbrock_client_with_strategies.py	New example script

[Lance-Drane]

Could you add tests for the new strategies? Unit tests alone should be fine. You can either use the existing file in tests/unit/ or create your own file(s) in tests/unit (as long as the tests are in tests/unit/ I am impartial as to how they are organized)

API looks fine