## Environment
**Liquibase Version**: 4.3.1

**Liquibase Integration & Version**: n/a

**Liquibase Extension(s) & Version**: n/a 

**Database Vendor & Version**: Oracle and MSSQL

**Operating System Type & Version**: n/a

## Description
If you have an `addForeignKeyConstraint` change with attribute `deleteCascade="true"` it is simply ignored.
This code: https://github.com/liquibase/liquibase/blob/43ed0e54adedc5f12c7933b998550e777d9b683d/liquibase-core/src/main/java/liquibase/change/core/AddForeignKeyConstraintChange.java#L195-L199 suggests that it should be automatically translated to `onDelete="CASCADE"` which would make sense, but it is not.
It currently is simply ignored.


* the VALIDATE keyword defines whether a foreign key constraint on a column in a table
     * should be checked if it refers to a valid row or not.
     * @return true if ENABLE VALIDATE (this is the default), or false if ENABLE NOVALIDATE.
     */
    @DatabaseChangeProperty(description = "This is true if the foreign key has 'ENABLE VALIDATE' set, or false if the foreign key has 'ENABLE NOVALIDATE' set.")
    public Boolean getValidate() {
        return shouldValidate;
    }
    /**
     *
     * @param shouldValidate - if shouldValidate is set to FALSE then the constraint will be created
     * with the 'ENABLE NOVALIDATE' mode. This means the constraint would be created, but that no
     * check will be done to ensure old data has valid foreign keys - only new data would be checked
     * to see if it complies with the constraint logic. The default state for foreign keys is to
     * have 'ENABLE VALIDATE' set.
     */
    public void setValidate(Boolean shouldValidate) {
        this.shouldValidate = shouldValidate;
    }
    
    public void setInitiallyDeferred(Boolean initiallyDeferred) {
        this.initiallyDeferred = initiallyDeferred;
    }
    public void setDeleteCascade(Boolean deleteCascade) {
        if ((deleteCascade != null) && deleteCascade) {
            setOnDelete("CASCADE");
        }
    }
    public void setOnUpdate(String rule) {
        this.onUpdate = rule;