Update upsert method to support return_keys and safe execution for Table and Declarative objects

[faizanazim11]

Overview

Update the upsert method in sql_utils to add support for the return_keys parameter. Ensure that all logic involving return_keys uses a safe execution style, as present in some existing functions, to correctly handle both Table objects and Declarative objects.

Tasks

• Add return_keys support to the upsert method.
• Refactor all code paths where return_keys is used to adopt the safe execution approach found in some functions.
• Ensure compatibility for both Table and Declarative objects when handling return_keys.
• Add or update relevant tests to cover new and refactored logic.
• Update package version from 1.1.1 to 1.2.0.

Acceptance Criteria

• upsert method correctly supports and returns return_keys for both Table and Declarative objects.
• No breaking changes in existing logic; refactored code uses the safe handling pattern.
• All affected code paths are tested for both object types.
• The implemetation to match in both sync and async versions.

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If relevant, please attach code snippets or references to existing safe execution style implementations for clarity.