[SPARK-53737][SQL][SS] Add Real-time Mode trigger #52473
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What changes were proposed in this pull request?
Introduce a new trigger type for Real-time Mode (RTM) in Structured Streaming. This new trigger will be how users enable their Structured Streaming query to run in Real-time Mode.
Please note this PR just adds the trigger. Users cannot yet run queries in Real-time Mode. Other functionality will come in later PRs.
Why are the changes needed?
This serves as the first PR to add Real-time mode to Structured Streaming.
Does this PR introduce any user-facing change?
Yes, it adds a new trigger type to Structured Streaming. This change does not effect or change any existing behaviors.
How was this patch tested?
Unit test added.
Was this patch authored or co-authored using generative AI tooling?
No