XDS-Server: Re-written db-dump script in python

db-dump script used to list (installable + installed) AGL SDKs is currently wrriten in nodejs.

In order to remove this dependency with nodejs, because it is the only script in xds-server that requires nodejs, this script must be rewritten into python.

https://gerrit.automotivelinux.org/gerrit/gitweb?p=src/xds/xds-server.git;a=blob;f=scripts/sdks/agl/db-dump;h=aa8b30df5b72055302aa2c90643d9ce73b634179;hb=HEAD

Refer to README.md (https://gerrit.automotivelinux.org/gerrit/gitweb?p=src/xds/xds-server.git;a=blob;f=scripts/sdks/README.md;h=97bae2111988178e5fb2d1cad68cd657f91eaae7;hb=HEAD) for more details about script usage.