YQL-21363: Support EvaluateAtom source on YqlSelect

#### Support EvaluateAtom source in YqlSelect ✎

- Introduces support for `EvaluateAtom` as a source in YqlSelect, enabling dynamic cluster and key resolution at query execution time
- Replaces literal string fields with deferred atom types to allow expression evaluation for cluster and key identifiers
- Adds logic to convert deferred atoms to `EvaluateAtom` nodes during query compilation, supporting complex expressions in table references
- Enables usage of variables and string concatenation in cluster and table path specifications, enhancing query flexibility
- Updates parsing and building logic to handle deferred atoms in table references while maintaining backward compatibility
- Adds new test cases to verify the functionality with variable expressions and dynamic table paths

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