Fix sequence from serial pre-condition validation for Postgresql

[filipelautert]

Create a specific query for Postgresql, as sequences created by serial type are computed as autoincrement instead of normal sequence by SequenceSnapshotGenerator

Impact

• Bug fix (non-breaking change which fixes expected existing functionality)
• Enhancement/New feature (adds functionality without impacting existing logic)
• Breaking change (fix or feature that would cause existing functionality to change)

Description

Create a specific query for Postgresql to be used by pre conditions as sequences created by serial type are computed as autoincrement instead of normal sequence by SequenceSnapshotGenerator

Additional Context

Fixes #1163

[MalloD12]

I think it would be nice to add a changeset like this one:

<changeSet id="11" author="931@company.ru">
<preConditions onFail="MARK_RAN">
<not>
<sequenceExists sequenceName="analytics_queue_id_seq"/>
</not>
</preConditions>
<createSequence sequenceName="analytics_queue_id_seq" incrementBy="1" startValue="1" />
</changeSet>

To our root.changelog.xml from our Postgres integration tests.