Revert "HHH-8945 increased default map size"

This reverts commit 31a4b22e44edf238f0179c219b7d42931eb80910.
Revert "HHH-8945 introduced "hibernate.session.initial_capacity" to reduce"

This reverts commit 284e219fd38776e6e809ff29f305d4b89ab64955.
HHH-9001 Unnecessary Stack object being allocated in
org.hibernate.engine.internal.Cascade

Conflicts:
	hibernate-core/src/main/java/org/hibernate/engine/internal/Cascade.java
HHH-8878 Fix logged message about PooledLoOptimizer being created

Conflicts:
	hibernate-core/src/main/java/org/hibernate/id/enhanced/OptimizerFactory.java

Conflicts:
	hibernate-core/src/main/java/org/hibernate/id/enhanced/OptimizerFactory.java
	hibernate-core/src/main/java/org/hibernate/internal/CoreMessageLogger.java
HHH-8878 Avoid hot allocation in PooledLoOptimizer

Conflicts:
	hibernate-core/src/main/java/org/hibernate/id/enhanced/OptimizerFactory.java
HHH-8878 Remove some dead code
HHH-8950 Avoid repeated array allocation for sqlTypes
HHH-9003 Avoid allocating arrays in most methods of ComponentType