MDEV-18478 ANALYZE for statement should show selectivity of ICP, part#2

Part#2, variant 2: Make the printed r_ values in JSON output consistent.
After this patch, ANALYZE output has:

- r_index_rows (NEW) - Observed number of rows before ICP or Rowid Filtering
  checks. This is a per-scan average. like r_rows and "rows" are.

- r_rows (AS BEFORE) - Observed number of rows after ICP and Rowid Filtering.

- r_icp_filtered (NEW) - Observed selectivity of ICP condition.

- (AS BEFORE) observed selectivity of Rowid Filter is in
  $.rowid_filter.r_selectivity_pct

- r_total_filtered - Observed combined selectivity: fraction of rows left
  after applying ICP condition, Rowid Filter, and attached_condition.
  This is now comparable with "filtered" and is printed right after it.

- r_filtered (AS BEFORE) - Observed selectivity of "attached_condition".

Tabular ANALYZE output is not changed. Note that JSON's r_filtered and
r_rows have the same meanings as before and have the same meaning as in
tabular output.

mysql-test/suite/federated/federatedx_create_handlers.result

@@ -253,6 +253,7 @@ ANALYZE
           "r_other_time_ms": "REPLACED",
           "r_engine_stats": REPLACED,
           "filtered": 100,
+          "r_total_filtered": 100,
           "r_filtered": 100
         }
       },
@@ -273,6 +274,7 @@ ANALYZE
           "r_table_time_ms": "REPLACED",
           "r_other_time_ms": "REPLACED",
           "filtered": 100,
+          "r_total_filtered": 100,
           "r_filtered": 100,
           "materialized": {
             "query_block": {