[Feature Request] Tag support for configs

Add item tag support for configs?
Example:
```
[
{
//items
"minecraft:potion": 16
},
{
//tags
"minecraft:logs": 16
},
{
"permissionLevel": 4,
"stackEmptyShulkerBoxOnly": 0
}
]
```

The issue provides only a configuration example and does not name files, tests, or entry points. Start by locating how item configuration entries are parsed and matched, then determine how the shown tag form should behave. Done means configs accept item tags such as minecraft:logs with the requested stack size and have coverage for the new behavior.

Written by the indexing model from the issue text.