pg15 conf file

[anasY2]

Adds appropriate authentication method in pg_hba.conf file sample that works with Postgres version 15.
Closes #4 .

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[selectiveduplicate]

@robert-s-lee I think we need your review here. The issue only talks about adding the trust authentication method to each record. Does that mean we don't need to talk about the other auth-methods? If not, we can just edit the existing sample from this:

# allow remote replication connection from any client machine  to <username> (IPv4 + IPv6)
host     replication          <username>    0.0.0.0/0                        <auth-method>
host     replication          <username>    ::0/0                            <auth-method>

To this:

# allow remote replication connection from any client machine  to <username> (IPv4 + IPv6)
host     replication          <username>    0.0.0.0/0                        trust
host     replication          <username>    ::0/0                            trust

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Copy pasting my comment from the first PR.