Optimize performance of my_bitmap

MDEV-33502 Slowdown when running nested statement with many partitions

This change was triggered to help some MariaDB users with close to
10000 bits in their bitmaps.

- Change underlaying storage to be 64 bit instead of 32bit.
  - This reduses number of loops to scan bitmaps.
  - This can cause some bitmaps to be 4 byte large.
- Ensure that all not used top-bits are always 0 (simplifes code as
  the last 64 bit storage is not a special case anymore).
- Use my_find_first_bit() to find the first set bit which is much faster
  than scanning trough things byte by byte and then bit by bit.

Other things:
- Added a bool to remember if my_bitmap_init() did allocate the bitmap
  array. my_bitmap_free() will only free arrays it did allocate.
  This allowed me to remove setting 'bitmap=0' before calling
  my_bitmap_free() for cases where the bitmap's where allocated externally.
- my_bitmap_init() sets bitmap to 0 in case of failure.
- Added 'universal' asserts to most bitmap functions.
- Change all remaining calls to bitmap_init() to my_bitmap_init().
  - To finish the change from 2014.
- Changed all usage of uint32 in my_bitmap.h to my_bitmap_map.
- Updated bitmap_copy() to handle bitmaps of different size.
- Removed const from bitmap_exists_intersection() as this caused casts
  on all usage.
- Removed not used function bitmap_set_above().
- Renamed create_last_word_mask() to create_last_bit_mask() (to match
  name changes in my_bitmap.cc)
- Extended bitmap-t with test for more bitmap functions.

storage/mroonga/ha_mroonga.cpp

@@ -4923,7 +4923,8 @@ int ha_mroonga::open(const char *name,
     DBUG_RETURN(error);
   thr_lock_data_init(&share->lock,&thr_lock_data,NULL);
 
-  if (bitmap_init(&multiple_column_key_bitmap, NULL, table->s->fields, false))
+  if (my_bitmap_init(&multiple_column_key_bitmap, NULL, table->s->fields,
+                     false))
   {
     mrn_free_share(share);
     share = NULL;
@@ -4939,7 +4940,7 @@ int ha_mroonga::open(const char *name,
 
   if (error)
   {
-    bitmap_free(&multiple_column_key_bitmap);
+    my_bitmap_free(&multiple_column_key_bitmap);
     mrn_free_share(share);
     share = NULL;
   }
@@ -5017,7 +5018,7 @@ int ha_mroonga::close()
   {
     error = add_wrap_hton(share->table_name, share->hton);
   }
-  bitmap_free(&multiple_column_key_bitmap);
+  my_bitmap_free(&multiple_column_key_bitmap);
   if (share->use_count == 1) {
     mrn_free_long_term_share(share->long_term_share);
   }

storage/mroonga/lib/mrn_smart_bitmap.cpp

@@ -26,7 +26,7 @@ namespace mrn {
 
   SmartBitmap::~SmartBitmap() {
     if (bitmap_) {
-      bitmap_free(bitmap_);
+      my_bitmap_free(bitmap_);
     }
   }