Adds the Delta Lake CDC read transforms to the Managed I/O API

[chamikaramj]

Also,

• Exposes the Delta CDC metadata columns via a new property exposed through the managed I/O API.
• Adds a Dataflow integration test.

This fixes #39492.

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[ahmedabu98]

Thanks, left a few comments. The rest looks good

[chamikaramj]

Thanks. PTAL.

[ahmedabu98]

LGTM

[chamikaramj]

Thanks!