Add proposal call data and log json to migration script console logs

[peersky]

When running migration reviews OpenZeppelin needs to have a reliable input data of upcoming migration.

Enact Migration script is a convenient way as part of Pull request review. However, currently, Enact Migration script outputs do not show upcoming proposal call-data, nor is the event log formatted in any known canonical form (example).

Current Pull request:

• adds additional private function to deploymentManager.ts that attempts to print:
  • Proposal calldata to console log
  • Proposal event in JSON ethersjs format
• calls this new function whenever trace() is used with a transaction input
• Adds unit tests that verify that code
  • Does print call data in console
  • Does not crash and does not print unknown log event data

This will

• Speed up migration review process