feat: #1007 new fam app admin model

[ianliuwk1019]

• Add V32 flyway script for new "fam_application_admin" table.
• Add new proxy db user in V32 flyway script and grant privilege on "fam_application_admin", "fam_application" and "fam_user" tables.
• Add ORM mapping to the existing model.py for new table and relationship.
• Add new environment place_holder values for flyway migration for Docker compose and for terraform.

[MCatherine1994]

also wondering do we need to add the new db user to this file? not sure what this is for....

[ianliuwk1019]

Hi @basilv I have updated the password to be some temporary dummy value. Catherine review and approves it. Will merge this one for Catherine to continue on her task; password will be then changed.

also wondering do we need to add the new db user to this file? not sure what this is for....

I don't know what this file is for, never hear from others before, and I feel we don't need to change it as I don't even see lambda api here. I feel it is ok. When testing the terraform in task 2, we can see if our change is working.