add paddle enforce count sh, test=develop, test=document_fix (#21178)

tools/count_invalid_enforce.sh

+#!/bin/bash
+ALL_PADDLE_CHECK=`grep -r -zoE "(PADDLE_ENFORCE[A-Z_]{0,9}|PADDLE_THROW)\(.[^,\);]*.[^;]*\);\s" ../paddle/fluid || true`
+ALL_PADDLE_CHECK_CNT=`echo "$ALL_PADDLE_CHECK" | grep -cE "(PADDLE_ENFORCE|PADDLE_THROW)" || true`
+VALID_PADDLE_CHECK_CNT=`echo "$ALL_PADDLE_CHECK" | grep -zoE '(PADDLE_ENFORCE[A-Z_]{0,9}|PADDLE_THROW)\((.[^,;]+,)*.[^";]*(errors::).[^"]*".[^";]{20,}.[^;]*\);\s' | grep -cE "(PADDLE_ENFORCE|PADDLE_THROW)" || true`
+
+echo "----------------------------"
+echo "PADDLE ENFORCE & THROW COUNT"
+echo "----------------------------"
+echo "All PADDLE_ENFORCE{_**} & PADDLE_THROW Count: ${ALL_PADDLE_CHECK_CNT}"
+echo "Valid PADDLE_ENFORCE{_**} & PADDLE_THROW Count: ${VALID_PADDLE_CHECK_CNT}"
+echo "Invalid PADDLE_ENFORCE{_**} & PADDLE_THROW Count: $(($ALL_PADDLE_CHECK_CNT-$VALID_PADDLE_CHECK_CNT))"