[EPIC] Improve `metrics` tracking in `EXPLAIN ANALYZE`

[2010YOUY01]

Is your feature request related to a problem or challenge?

This issue is to track ideas for improving metrics tracking, such as implementing useful metrics that are currently missing.

• Add output_bytes metrics to Explain Analyze #16244
• Inconsistent time_elapsed_scanning_total result across different queries scanning the same data #16619
• Add a fine grain memory usage tracking / break down of memory usage *within* each operator #16904
• MetricValue::Custom encoding\decoding support #16945
• Include metric output_batches into BaselineMetrics #17027
• Epic: Decides default metrics to show in EXPLAIN ANALYZE across operators #18116
• Improve metrics in DataSourceExec with Parquet source #18195
• RepartitionExec is missing BaselineMetrics #18218
• feat: Add selectivity metrics to FilterExec #18406
• Support reduction_fator metric (for EXPLAIN ANALYZE) in AggregateExec #18410
• Add selectivity metrics (for Explain Analyze) in Hash Join #18409
• Support selectivity metrics (for Explain Analyze) in Nested Loop Join #18407
• Track individual expr's execution time in ProjectExec metrics (in EXPLAIN ANALYZE) #18456
• Minor enhancements to EXPLAIN ANALYZE output formatting #18689

Describe the solution you'd like

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Describe alternatives you've considered

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Additional context

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[simonvandel]

ProjectionExec currently shows the total elapsed time for all expressions. Would it make sense to show timings for each individual expression? Perhaps we could do it in VERBOSE mode