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Split ExecUpdate and ExecDelete into reusable pieces

Create subroutines ExecUpdatePrologue / ExecUpdateAct / ExecUpdateEpilogue, and similar for ExecDelete. Introduce a new struct to be used internally in nodeModifyTable.c, dubbed ModifyTableContext, which contains all context information needed to perform these operations, as well as ExecInsert and others. This allows using a different schedule and a different way of evaluating the results of these operations, which can be exploited by a later commit introducing support for MERGE. It also makes ExecUpdate and ExecDelete proper shorter and (hopefully) simpler. Author: Álvaro Herrera <alvherre@alvh.no-ip.org> Reviewed-by: Amit Langote <amitlangote09@gmail.com> Reviewed-by: Japin Li <japinli@hotmail.com> Reviewed-by: Zhihong Yu <zyu@yugabyte.com> Discussion: https://postgr.es/m/202202271724.4z7xv3cf46kv@alvherre.pgsql

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src
- backend/executor
  - nodeModifyTable.c
- tools/pgindent
  - typedefs.list

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