Changes

Add priority and tooltip visibility to composable modifiers

Might be worth letting the modules take a poll on priority if you don't set it, but thats a later feature to consider

Implement tooltip modifier hook

Will be used in many upcoming composable modules

Add tool build modifier hooks

Small semantic change in the removal hooks: before you had onRemove (no return) called early during modifier removal and validate called with 0 late in removal. With the new hooks, onRemove has a return and handles removal validation.
In 1 out of 3 cases, the old hooks will function exactly the same as before. Apparently they were called inconsistently though, so the order of removal vs validations changes slightly for the other two cases.
I do not believe it was possible to rely on the old order hence the breaking change, this new order just makes it so much easier to understand.

Migrate enchantment modifier to modifier modules

Did not move the static helpers as come 1.19 those will not be needed anymore due to the nice new forge hooks. So in a sense, its doubly deprecated.

Migrate extra modifier to modifier modules

Cannot migrate swappable for now as it needs a tool sensitive display name