Added rowid_filter support to Aria

This includes:
- cleanup and optimization of filtering and pushdown engine code.
- Adjusted costs for rowid filters (based on extensive testing
  and profiling).

This made a small two changes to the handler_rowid_filter_is_active()
API:
- One should not call it with a zero pointer!
- One does not need to call handler_rowid_filter_is_active() for every
  row anymore. It is enough to check if filter is active by calling it
  call it during index_init() or when handler::rowid_filter_changed()
  is called

The changes was to avoid unnecessary function calls and checks if
pushdown conditions and rowid_filter is not used.

Updated costs for rowid_filter_lookup() to be closer to reality.
The old cost was based only on rowid_compare_cost. This is now
changed to take into account the overhead in checking the rowid.

Changed the Range_rowid_filter class to use DYNAMIC_ARRAY directly
instead of Dynamic_array<>. This was done to be able to use the new
append_dynamic() functions which gives a notable speed improvment
compared to the old code.  Removing the abstraction also makes
the code easier to understand.

The cost of filtering is now slightly lower than before, which
is reflected in some test cases that is now using rowid filters.

mysql-test/main/opt_trace_index_merge.result

@@ -329,7 +329,7 @@ set optimizer_trace='enabled=on';
 #  3-way ROR-intersection
 explain select key1,key2,key3 from t1 where key1=100 and key2=100 and key3=100;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	ref|filter	key1,key2,key3	key1|key2	5|5	const	2243 (3%)	Using where; Using rowid filter
+1	SIMPLE	t1	index_merge	key1,key2,key3	key1,key2	5,5	NULL	77	Using intersect(key1,key2); Using where
 select JSON_DETAILED(JSON_EXTRACT(trace, '$**.analyzing_range_alternatives')) from INFORMATION_SCHEMA.OPTIMIZER_TRACE;
 JSON_DETAILED(JSON_EXTRACT(trace, '$**.analyzing_range_alternatives'))
 [
@@ -423,22 +423,6 @@ JSON_DETAILED(JSON_EXTRACT(trace, '$**.analyzing_range_alternatives'))
         },
         "analyzing_index_merge_union": 
         []
-    },
-    {
-        "range_scan_alternatives": 
-        [
-            {
-                "index": "key2",
-                "ranges": 
-                ["(100) <= (key2) <= (100)"],
-                "rowid_ordered": true,
-                "using_mrr": false,
-                "index_only": true,
-                "rows": 2243,
-                "cost": 0.312832109,
-                "chosen": true
-            }
-        ]
     }
 ]
 select JSON_DETAILED(JSON_EXTRACT(trace, '$**.chosen_range_access_summary')) from INFORMATION_SCHEMA.OPTIMIZER_TRACE;
@@ -473,19 +457,6 @@ JSON_DETAILED(JSON_EXTRACT(trace, '$**.chosen_range_access_summary'))
         "rows_for_plan": 77,
         "cost_for_plan": 0.572490756,
         "chosen": true
-    },
-    {
-        "range_access_plan": 
-        {
-            "type": "range_scan",
-            "index": "key2",
-            "rows": 2243,
-            "ranges": 
-            ["(100) <= (key2) <= (100)"]
-        },
-        "rows_for_plan": 2243,
-        "cost_for_plan": 0.312832109,
-        "chosen": true
     }
 ]
 # ROR-union(ROR-intersection, ROR-range)