Launch Chopsticks forking Kusama and an indexer pointed at it in tests

[Tbaut]

closes #394

The CI now has

• a Postgres for the indexer
• Chopsticks funding 4 accounts and forking Kusama
• Subsquid indexer pointing at Chopsticks, and running alongside a graphQL server
• a minimal test with the full creation of a multisig, with proxy, with 3 of the funded accounts

We need to make this test encompass many more scenarii.
Unfortunately, all these things running in parallel means that the output in CI is very messy.
To test locally, I also made sure we have a simple command. It's npm run start:chopsticks-test-build-and-launch-all which will (quoting the README)

# Launch the full setup. It will:
# - delete any previous Chopsticks database
# - launch a docker with the indexer db
# - launch a Chopsticks node
# - build and launch a subsquid indexer pointed at Chopsticks
# - launch a graphQL server for the squid
# - launch the UI with local env pointed at Chopsticks

[asnaith]

I left a few minor comments that's all.

This is great, the closest we can get to live testing and with no mocks. 🙌

Thank you for all the effort with this, it's well worth it 🚀

[Lykhoyda]

Thank you for such a great improvement!