* debt shares class is mostly done
* issuer changes mostly done
* feepool changes mostly done
* tests cleaned up a little bit

biggest thing still needing finalization is function to "transfer" debt to layer 2

Removed some functions it turns out we don't need

found one bug during testing in `sharePercentOnPeriod` function

the `interact` hardhat task has been refactored and moved
into its own package, `hardhat-interact`. This PR removes the old
code from the repository and uses the new package.

`synthetix` uses a custom system for managing deployments of its
contracts. To account for this, the `interact` command has been
extended to first regenerate the deployment manifests into a compliant
format.

Since `hardhat-interact` relies on hardhat configuration for network
and signer configuration, the `hardhat.config.js` file has been updated
to include our networks.

notes:
* package-lock.json verification may fail because of new NPM 8 format.
how do we work around this?

* debt shares class is mostly done
* issuer changes mostly done
* feepool changes mostly done
* tests cleaned up a little bit

biggest thing still needing finalization is function to "transfer" debt to layer 2

Removed some functions it turns out we don't need

found one bug during testing in `sharePercentOnPeriod` function

…h interact

…synthetix into sip-185-debt-shares

only a couple things not working for dual tests

…s to rebuildCache

…s to rebuildCache

…hetix into sip-165-oracles

SIP-165 was recently updated to use an additional oracle, and replacing the
original oracle so it only

this has created a bit of wierd indirection in the Issuer (which likely only needs to query the DebtRatio oracle), so might need to do a little
more cleanup on this, but its mostly what we want

…f the system

…hetix into sip-165-oracles

will allow for owner to override to prevent circuit breaker re-trigger after resuming
the system