feat: Add pawn creation

[pacampbell]

Removed 3 pawns automatically being created for the player. Pawns are now unlocked by performing the proper steps to unlock and create new pawns.

• The first pawn is unlocked for free after completing the main story quest "A Servant's Pledge".
• The second pawn can be unlocked by spending 10x riftstone shards in the "Myrmidon's Pledge" menu at the White Dragon.
• The third pawn can be unlocked by unlocking all nodes in the third page of the BO tree and spending 10x riftstone shards in the "Myrmidon's Pledge" menu at the White Dragon.

Checklist:

• [x] The project compiles
• [x] The PR targets develop branch

[pacampbell]

Should I add shards as a reward to the pawn quest so the player can get 2 pawns easily? or leave it as is?

[alborrajo]

Should I add shards as a reward to the pawn quest so the player can get 2 pawns easily? or leave it as is?

It'd be better to have them be in a shop, as shards were a regular item you could sell (imagine accidentally selling this unique item you couldnt obtain any other way) and they could also be used for pawn reincarnation. Maybe we should make reincarnation cost something again 🤔