Add additional enchantment restrictions

[arbron]

Currently the only restrictions on enchantments are whether the item is magical and what broad item type it is (e.g. weapon, equipment). There are a number of enchantments which have more specific restrictions:

• Specific sub-type (e.g. only martial weapons, only shields)
• Has a certain property (e.g. only weapons with the Ammunition or Thrown properties)

[pgervais70]

allowing also to filter on system.type and system.subtype even on damage types could be interesting.

To allow further custom filtering, a hook call could also be added. It could allow to extend the canEnchant method from EnchantmentField https://github.com/foundryvtt/dnd5e/blob/1449db20b7acd0b45ef49c54e2c00c9828493156/module/data/item/fields/enchantment-field.mjs#L175