[IMPALA-12087] Performance improvements on Iceberg table queries - ASF JIRA

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1.	Skip pushing down Iceberg predicates to Impala scanner if not needed	Resolved	Gabor Kaszab
2.	Optimize count(*) queries for Iceberg V2 tables	Resolved	Li Penglin
3.	Make the predicate pushdown skipping improvement work with the count(*) query rewrite improvement	Open	Unassigned
4.	Be able to skip pushing down a subset of the predicates	Resolved	Peter Rozsa