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changefeedccl: make balanced_simple distribution strategy a changefeed option #147628

@rharding6373

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@rharding6373

It's useful to have balanced changefeed plans, but there are trade-offs involved with setting changefeed.default_range_distribution_strategy="balanced_simple". 1) Since it's a cluster setting, it applies to all changefeeds, 2) the algorithm naively redistributes spans across aggregators with no regard for replica placement. If this were a changefeed option instead of a cluster setting, users could have more control over which changefeeds it applies to (e.g., initial scans vs long-running feeds).

Jira issue: CRDB-51173

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A-cdcChange Data CaptureC-enhancementSolution expected to add code/behavior + preserve backward-compat (pg compat issues are exception)O-supportWould prevent or help troubleshoot a customer escalation - bugs, missing observability/tooling, docsP-2Issues/test failures with a fix SLA of 3 monthsT-cdc

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