sapphire-localnet: Add support for running ROFLs

[matevz]

This PR:

• adds support for starting ROFLS within the sapphire-localnet including supprot for fixtures, ROFL registration and funding the admin and the node accounts
• enables oasis-node -test-mnemonic by default
• configures Localnet for Oasis CLI and sets it as default

Fixes #603, #613

To start your ROFL, simply bind mount your folder containing the .orc file to the /rofls folder and it will spin it up automatically.

For example:

$ docker run -it -p8545:8545 -p8546:8546 -v /home/oa/rofl-oracle:/rofls ghcr.io/oasisprotocol/sapphire-localnet:local 
sapphire-localnet local (oasis-core: 24.2, sapphire-paratime: 0.8.2-testnet, oasis-web3-gateway: 5.1.0)

 * Detected ROFL bundle: /rofls/rofl-oracle.orc
 * Starting oasis-net-runner with sapphire...
 * Waiting for Postgres to start.....
 * Waiting for Oasis node to start....
 * Starting oasis-web3-gateway...
 * Bootstrapping network (this might take a minute).
 * Waiting for nodes to be ready....
 * Setting epoch to 1...
 * Waiting for key manager to generate ephemeral secret....
 * Setting epoch to 2...
 * Waiting for key manager......
 * Populating accounts...

Available Accounts
==================
(0) 0xf39Fd6e51aad88F6F4ce6aB8827279cffFb92266 (10000 TEST)
(1) 0x70997970C51812dc3A010C7d01b50e0d17dc79C8 (10000 TEST)
(2) 0x3C44CdDdB6a900fa2b585dd299e03d12FA4293BC (10000 TEST)
(3) 0x90F79bf6EB2c4f870365E785982E1f101E93b906 (10000 TEST)
(4) 0x15d34AAf54267DB7D7c367839AAf71A00a2C6A65 (10000 TEST)

Private Keys
==================
(0) 0xac0974bec39a17e36ba4a6b4d238ff944bacb478cbed5efcae784d7bf4f2ff80
(1) 0x59c6995e998f97a5a0044966f0945389dc9e86dae88c7a8412f4603b6b78690d
(2) 0x5de4111afa1a4b94908f83103eb1f1706367c2e68ca870fc3fb9a804cdab365a
(3) 0x7c852118294e51e653712a81e05800f419141751be58f605c371e15141b007a6
(4) 0x47e179ec197488593b187f80a00eb0da91f1b9d0b13f8733639f19c30a34926a

HD Wallet
==================
Mnemonic:       test test test test test test test test test test test junk
Base HD Path:   m/44'/60'/0'/0/%d

 * Configuring ROFL /rofls/rofl-oracle.orc:
   Enclave ID 0+tTmlVjUvP0eIHXH7Dld3svPppCUdKDwYxnzplndLea/8+uR7hI7CyvHEm0soNTHhzEJfk1grNoBuUqQ9eNGg==
   ROFL admin test:bob funded 10001 TEST
   Compute node oasis1qp6tl30ljsrrqnw2awxxu2mtxk0qxyy2nymtsy90 funded 1000 TEST
   App ID rofl1qqn9xndja7e2pnxhttktmecvwzz0yqwxsquqyxdf

WARNING: The chain is running in ephemeral mode. State will be lost after restart!

 * Listening on http://localhost:8545 and ws://localhost:8546. Chain ID: 0x5afd
 * Container start-up took 66 seconds, node log level is set to warn.

[CedarMist]

Some tests in sapphire-paratime are failing with this, namely the hardhat-ignition (Ethers) tests. Investigating.
They also seem to be failing with existing sapphire-localnet image, so it's not your problem.

[abukosek]

Please fix the indentation (originally the file used tabs, but some joker changed it to spaces and now it's chaos -- some parts use 4 spaces, some 2... 😞).

[abukosek]

Maybe add a : at the end of "Enclave ID", also below for "App ID".

[abukosek]

Approving, so it's usable for the workshop, but please fix the indentation soon, so the code doesn't turn into a mess again :D (I don't care what you use, as long as it's consistent for the entire file.)

[matevz]

Approving, so it's usable for the workshop, but please fix the indentation soon, so the code doesn't turn into a mess again :D (I don't care what you use, as long as it's consistent for the entire file.)

Using 2 spaces now in throughout start.sh since this is already what we used in spinup-oasis-stack.sh.