Determines if the provided Zod schema is "shapeless".
A shapeless schema is one that does not define any object shape,
such as ZodString, ZodNumber, ZodBoolean, ZodAny, etc.
For ZodObject, it must have no shape keys to be considered shapeless.
ZodRecord schemas are considered shapeless since they define dynamic
key-value mappings without fixed keys.
Determines if the provided Zod schema is "shapeless". A shapeless schema is one that does not define any object shape, such as ZodString, ZodNumber, ZodBoolean, ZodAny, etc. For ZodObject, it must have no shape keys to be considered shapeless. ZodRecord schemas are considered shapeless since they define dynamic key-value mappings without fixed keys.