Update server information from TiDB to TiDB for PostgreSQL

[leeraya]

description

Update some console info like "Welcome to TiDB"。
When I start TiDB for PostgreSQL source code on my local PC。I see “Welcome to TiDB” on the console output

task

Update console inforamtion，It should be like “Welcome to TiDB for PostgreSQL” and so on

expected

It will show TiDB for PostgreSQL server information when started locally or connected by cmd or alomost anywhere