[Mercs] Add Mercenary Support (#2745)

* [Mercs] Add Mercenary Support

# Notes
- Adds `--merc-tables` support to database dumper.
- Adds Mercenary-based repositories.
- Adds required SQL `2023_01_15_merc_data.sql` to insert the tables for those who don't already have them.
- Adds optional SQL `2023_01_15_merc_liaisons.sql` to change NPCs to the Mercenary Liaison class optionally.

* Inline.

* Trim tables_to_dump output

Co-authored-by: Akkadius <akkadius1@gmail.com>

utils/sql/db_update_manifest.txt

@@ -469,6 +469,7 @@
 9213|2022_12_24_npc_keeps_sold_items.sql|SHOW COLUMNS FROM `npc_types` LIKE 'keeps_sold_items'|empty|
 9214|2022_12_24_character_exp_toggle.sql|SHOW COLUMNS FROM `character_data` LIKE 'exp_enabled'|empty|
 9215|2023_01_08_zone_max_level.sql|SHOW COLUMNS FROM `zone` LIKE 'max_level'|empty|
+9216|2023_01_15_merc_data.sql|SHOW TABLES LIKE 'mercs'|empty|
 
 # Upgrade conditions:
 # 	This won't be needed after this system is implemented, but it is used database that are not

utils/sql/git/optional/2023_01_15_merc_liaisons.sql

@@ -0,0 +1,3 @@
+UPDATE `npc_types`
+SET `class` = 71
+WHERE `lastname` LIKE '%Mercenary Liaison';