feat(connectors): BI-6608 YDB Array support

[catsona]

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[Copilot]

Pull request overview

This PR adds support for YDB array operations by implementing array functions, type handling, and compilation logic for the YQL dialect.

• Implements array types (List) with optional item support in the dialect layer
• Adds lambda/closure compilation and tuple access operations for complex array manipulations
• Implements comprehensive array function definitions (ARRAY, CONTAINS, SLICE, REPLACE, etc.)

Reviewed changes

Copilot reviewed 7 out of 7 changed files in this pull request and generated 4 comments.

Show a summary per file

File	Description
lib/dl_sqlalchemy_ydb/dl_sqlalchemy_ydb/dialect.py	Adds YqlListType, YqlClosure, YqlDotAccess classes and custom compiler methods for array/lambda support
lib/dl_connector_ydb/docker-compose/Dockerfile.db-ydb	Updates YDB Docker image reference to use digest-based image from ydbplatform
lib/dl_connector_ydb/dl_connector_ydb_tests/db/formula/test_functions_array.py	Adds array function tests with view-based test setup for YDB
lib/dl_connector_ydb/dl_connector_ydb_tests/db/formula/base.py	Adds YQLDbEvaluator for handling bytes-to-string conversion in test results
lib/dl_connector_ydb/dl_connector_ydb/formula/definitions/functions_type.py	Adds List type specifications for Double, Int64, and String with optional item support
lib/dl_connector_ydb/dl_connector_ydb/formula/definitions/functions_array.py	Implements all array function definitions including ARRAY, CONTAINS, SLICE, REPLACE, etc.
lib/dl_connector_ydb/dl_connector_ydb/formula/definitions/all.py	Imports and includes DEFINITIONS_ARRAY in the master definitions list

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