## 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_


if (!columnType.isAutoIncrement() && (statement.getDefaultValue(column) != null)) {
                Object defaultValue = statement.getDefaultValue(column);
                if (database instanceof MSSQLDatabase) {
                    String constraintName = statement.getDefaultValueConstraintName(column);
                    if (constraintName == null) {
                        constraintName = ((MSSQLDatabase) database).generateDefaultConstraintName(statement.getTableName(), column);
                    }
                    buffer.append(" CONSTRAINT ").append(database.escapeObjectName(constraintName, ForeignKey.class));
                }
                if ((database instanceof OracleDatabase) && statement.getDefaultValue(column).toString().startsWith
                        ("GENERATED ALWAYS ")) {
                    buffer.append(" ");
                } else if (database instanceof Db2zDatabase && statement.getDefaultValue(column).toString().contains("CURRENT TIMESTAMP")
                        || statement.getDefaultValue(column).toString().contains("IDENTITY GENERATED BY DEFAULT")) {
                    buffer.append(" ");
                } else {
                    buffer.append(" DEFAULT ");
                }
                if (defaultValue instanceof DatabaseFunction) {
                    buffer.append(database.generateDatabaseFunctionValue((DatabaseFunction) defaultValue));
                } else if (database instanceof Db2zDatabase) {
                    if (statement.getDefaultValue(column).toString().contains("CURRENT TIMESTAMP")) {
                        buffer.append("");
                    }
                    if (statement.getDefaultValue(column).toString().contains("IDENTITY GENERATED BY DEFAULT")) {
                        buffer.append("GENERATED BY DEFAULT AS IDENTITY");
                    }
                    if (statement.getDefaultValue(column).toString().contains("CURRENT USER")) {
                        buffer.append("SESSION_USER ");
                    }