RDBC-1057 Metadata wasn't attached to compare exchange value via session API

[poissoncorp]

Issue link

RDBC-1057 Issues with Compare Exchange API

Additional description

Fixes a bug with the compare exchange session API, adds a test that proves the fix works. Also adds 2 tests confirming that the compare exchange delete works properly.

Type of change

• Bug fix
• Regression bug fix
• Optimization
• New feature

How risky is the change?

• Low
• Moderate
• High
• Not relevant

Backward compatibility

• Non breaking change
• Ensured. Please explain how has it been implemented?
• Breaking change
• Not relevant

Is it platform specific issue?

• Yes. Please list the affected platforms.
• No

Documentation update

• This change requires a documentation update. Please mark the issue on YouTrack using Python Documentation Required tag.
• No documentation update is needed

Testing by Contributor

• x ] Tests have been added that prove the fix is effective or that the feature works
• It has been verified by manual testing
• Existing tests verify the correct behavior

Is there any existing behavior change of other features due to this change?

• Yes. Please list the affected features/subsystems and provide appropriate explanation
• No