HHH-8946 Optimize JdbcCoordinatorImpl for CPU performance

- unnecessary HashMap lookups
- size HashMap allocations appropriately
- a leak of tracked statements
- complex logging logic

Conflicts:
	hibernate-core/src/main/java/org/hibernate/engine/jdbc/internal/JdbcCoordinatorImpl.java
HHH-8946 corrected bug in register(ResultSet, Statement), improved
javadoc