feat: import hardspoon account balances from bricked standalone chain into genesis block of new standalone chain

[ltfschoen]

changes in this PR work with the following steps:

git fetch origin luke/hardspoon-accounts-substrate-3:luke/hardspoon-accounts-substrate-3
git checkout luke/hardspoon-accounts-substrate-3
./scripts/init.sh
cargo build --release

rm -rf /tmp/polkadot-chains

./target/release/datahighway \
  --base-path /tmp/polkadot-chains/alice \
  --name "Data Highway Development Chain" \
  --dev \
  --telemetry-url "wss://telemetry.polkadot.io/submit/ 0" \
  -lruntime=debug

go to https://polkadot.js.org/apps/?rpc=ws%3A%2F%2F127.0.0.1:9944#/settings/developer
and copy/paste https://github.com/DataHighway-DHX/node/blob/master/custom_types.json
and replace the custom types input field, then click "Save"

update the metadata too if necessary

then go to view in-built accounts at https://polkadot.js.org/apps/?rpc=ws%3A%2F%2F127.0.0.1:9944#/accounts

then check if imported accounts from old standalone chain have been imported by going to https://polkadot.js.org/apps/?rpc=ws%3A%2F%2F127.0.0.1:9944#/addresses

and add the treasury address 4LTFqiD6H6g8a7ur9WH4RxhWx2givWfK7o5EDed3ai1nYTvk and it should have 30 million DEV tokens

and check that the accounts in the genesis.json file were imported, for example the account here https://github.com/DataHighway-DHX/node/pull/250/files#diff-03ba6e560e063bae9ad8da38df998bafd6ac9c236bc8fed1ac6d610f01d1778dR3, 4MeuAmq5nbcub7q4UfjcQcd9kgDtYxnvbGmtEssowhGQUM3g when imported should have ~18.4 DEV