Add default wait strategy hook

[cristianrgreco]

Summary

• Add an optional protected getDefaultWaitStrategy() hook for container subclasses.
• Let the wait strategy selector use that fallback after explicit wait strategies and healthchecks have been considered.
• Document the hook for custom GenericContainer subclasses.

Verification

• npm run test -- packages/testcontainers/src/wait-strategies/utils/wait-strategy-selector.test.ts
• npm run check-compiles
• npm run lint
• npm run format
• git diff --check

Test Results

All listed checks passed locally.

Semver Impact

Minor. This adds a backward-compatible protected hook for subclasses without changing existing explicit wait strategy or healthcheck precedence. Existing containers still default to Wait.forListeningPorts() when no explicit/default wait strategy or healthcheck is available.

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