## Environment
**Liquibase Version**: org.liquibase:liquibase-core:jar:3.8.9

**Liquibase Integration & Version**: maven

**Database Vendor & Version**: postgres 11

**Operating System Type & Version**: ubuntu (wsl)

## Description
PrimaryKey constraint does not honor 'deferrable' and 'initiallyDeferred' settings so that created primary key is not 'deferred'

## Steps To Reproduce
Use script:

```
<databaseChangeLog xmlns="http://www.liquibase.org/xml/ns/dbchangelog"
                   xmlns:ext="http://www.liquibase.org/xml/ns/dbchangelog-ext"
                   xmlns:pro="http://www.liquibase.org/xml/ns/pro"
                   xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
                   xsi:schemaLocation="http://www.liquibase.org/xml/ns/dbchangelog-ext http://www.liquibase.org/xml/ns/dbchangelog/dbchangelog-ext.xsd http://www.liquibase.org/xml/ns/pro http://www.liquibase.org/xml/ns/pro/liquibase-pro-4.0.xsd http://www.liquibase.org/xml/ns/dbchangelog http://www.liquibase.org/xml/ns/dbchangelog/dbchangelog-4.0.xsd">
    <changeSet author="author" id="some-id">  
        <createTable tableName="abc">
            <column name="id" type="INTEGER">
                <constraints nullable="false" primaryKey="true" primaryKeyName="abc_PK" deferrable="true" initiallyDeferred="true"/>
            </column>
        </createTable>
    </changeSet>
</databaseChangeLog>
```

## Actual Behavior
2020-12-18 09:01:19.936 [main] INFO  liquibase.executor.jvm.JdbcExecutor - CREATE TABLE public.abc (id INTEGER NOT NULL, CONSTRAINT "abc_PK" PRIMARY KEY (id))

## Expected/Desired Behavior
PRIMARY KEY is created with _deferrable initially deferred_


}
  public PrimaryKeyConstraint(String constraintName, boolean validatePrimaryKey) {
    this.constraintName = constraintName;
    setValidatePrimaryKey(validatePrimaryKey);
  }
    public String getConstraintName() {
        return constraintName;
    }
    public String getTablespace() {
        return tablespace;
    }
    public PrimaryKeyConstraint setTablespace(String tablespace) {
        this.tablespace = tablespace;
        return this;
    }
    public List<String> getColumns() {
        return Collections.unmodifiableList(columns);
    }
    public PrimaryKeyConstraint addColumns(String... columns) {
        this.columns.addAll(Arrays.asList(columns));
        return this;
    }
  public boolean shouldValidatePrimaryKey() {
    return validatePrimaryKey;
  }
  public void setValidatePrimaryKey(boolean validatePrimaryKey) {
    this.validatePrimaryKey = validatePrimaryKey;
  }
}