feat: messageHash attaribute added in PostgreSQL + testcase

[ABresting]

Description

messageHash attributed added to PostgreSQL, which aims to remove the id attribute in upcoming PRs. An associated test case also added.

migration scripts will be changed after the deletion of id attribute in upcoming PRs.

Changes

• messageHash attribute added
• added test case to test the messageHash attribute

Issue

#2112

[github-actions]

This PR may contain changes to database schema of one of the drivers.

If you are introducing any changes to the schema, make sure the upgrade from the latest release to this change passes without any errors/issues.

Please make sure the label release-notes is added to make sure upgrade instructions properly highlight this change.

[Ivansete-status]

LGTM! Thanks for it! 💯
Just added a minor nitpick comment

[github-actions]

You can find the image built from this PR at

quay.io/wakuorg/nwaku-pr:2152

Built from c36ceb5

[Ivansete-status]

LGTM! Thanks for it! 💯 Just added a minor nitpick comment

I disapproved this PR as per the accident we had with SQLite. In this case, we will also need a migration script.
On the other hand, we should postpone this PR, and the Postgres changes as much as possible until we are clear with the SQLite side.