Add version based FF examples into contributor docs

[OGPoyraz]

Adds examples of recently added capability of RemoteFeatureFlagController

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Note

Expands docs/remote-feature-flags.md with version-based feature flag examples and how to combine version scope with threshold rollouts.

• Docs (docs/remote-feature-flags.md):
  • Version-based scope examples:
    • Adds object flag pattern using versions with semantic version matching (selects closest lower/equal app version).
    • Provides concrete examples and expected outcomes across app versions.
  • Composed scopes:
    • Shows combining version-based scope with threshold for progressive rollouts per version (e.g., 30% on 13.0.0+, 100% on 13.2.0+).
  • Clarifies deterministic behavior for version matching and rollout buckets.

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