YQL-21207: Hash runtime settings

#### Hash runtime settings for stable identification ✎

- Introduces a stable hash function for runtime settings to enable consistent identification of configuration states
- Implements `SHA-256` based hashing that includes both host settings and UDF settings with deterministic ordering
- Ensures hash stability regardless of setting insertion order by using ordered data structures
- Adds comprehensive unit tests to verify hash consistency, content sensitivity, and order independence
- Enhances configuration serialization to properly count and filter serializable settings
- Makes serialization order deterministic by switching from hash map to map for setting storage

<a href="https://nda.ya.ru/t/qa0kX64r7DqvtN"><font size="2">Autodescription by Yandex Code Assistant</font></a>
commit_hash:49aafc63bf011c335d556cd41dd4971473b62f13

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