SQL Standards for Flags and Bits

When I was changing `creature_template` the query was not in sync with the SQL standards implemented. Would be nice to get the job done using Keira instead of manually changing the query 😀

### Wrong example:
```
UPDATE `creature_template` SET `mechanic_immune_mask` = 617299803 WHERE `entry` = 7727;
```

### Good example:
```
-- Adding flags
UPDATE `creature_template` SET `mechanic_immune_mask`=`mechanic_immune_mask`|64|256|1024 WHERE `entry` = 7727;

-- Removing flags
UPDATE `creature_template` SET `mechanic_immune_mask`=`mechanic_immune_mask`&~(64|256|1024) WHERE `entry` = 7727;
```

Link: https://www.azerothcore.org/wiki/sql-standards#flags-amp-bits

---
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Start by reviewing the linked SQL standards section on flags and bits and the creature_template examples in the issue. Then trace the relevant Keira editing flow; done should allow flag additions and removals to follow the shown SQL standard instead of relying on a manually entered combined value.

Written by the indexing model from the issue text.