feat: pg-restore utility

[samrose]

What kind of change does this PR introduce?

Per request from @olirice we needed a tool to restore from a pg_dump that can restore to a given version of supabase/postgres

This util has a help flag that outputs the following

nix run .#pg-restore -- --help
Usage: nix run .#pg-restore -- [OPTIONS]

Run pg_restore with the specified parameters.

Options:
  --version     PostgreSQL version (currently only 15 is supported)
  --dbname      Name of the database to restore to
  --host        Host of the database server
  --user        Database user to connect as
  --file        Path to the file to restore from (absolute or relative to current directory)
  --port        Port number (default: 5432)
  -h, --help    Show this help message and exit
Example:
nix run .#pg-restore --  --version 15 --dbname postgres --host localhost --user postgres --port 5435 --file my.dump

[olirice]

nice, thanks!