Generalize APM package manager [ON HOLD]

[dapplion]

Part of dappnode/DAppNode#327

Change slightly the architecture of the SDK to accomodate multiple package managers (PMs)

A PM has to implement this simple API to fulfill all features of the SDK

export interface IPM {
  /** Returns semver string for latest version of `dnpName`'s canonical repo */
  getLatestVersion(dnpName: string): Promise<SemverStr>;

  /** Tests if the connected JSON RPC is listening and available. Uses the `net_listening` method. */
  isListening(): Promise<boolean>;

  /** Populate transaction to publish a new version or repo */
  populatePublishTransaction(inputs: TxInputs): Promise<TxSummary>;
}

From #213

[github-actions]

DAppNode bot has built and pinned the release to an IPFS node, for commit: 4e57cf6

This is a development version and should only be installed for testing purposes, install link

/ipfs/QmRtrTo7FtQ15K1U9i1bvh3KMCGhCHYaWmEq21d1sED9J8

(by dappnodebot/build-action)