PHP is crashing hard on large Type structures

[mabar]

orisai/openapi currently fails on creation of whole Type structure of the OpenAPI class if all nodes are allowed, because it creates more than ~10k objects and PHP fails with Exit Code: 139(Segmentation violation)

While it could be fixed by PHP, this whole structure is unreasonable. Instead, we could do this:

• MappedObjectType should be replaced with a lazy implementation - only when MappedObjectType is used, its inner objects are created. This would keep inicialized structure only in two levels of mapped objects at a time.
• When processing Type structure (mostly in Printer), types must be dereferenced as soon as we obtain all their inner types, so PHP could destroy them
• In Printer, write only first level of MappedObjectType on error, so we don't have to print stupidly large structures

[mabar]

Types themselves will have to store information if they are the first in hierarchy - simple circural references check as currently implemented by MappedObjectRule will be no longer possible, because structure will be created JIT, instead of immediately.

[github-actions]

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