Expose Module Reference in Contracts

[td202]

Feature proposal

Add the ability to query the module reference and contract name of a smart contract instance (given its address) within a smart contract.

• Node:
  • implement the new functionality (conditional on protocol version)
  • benchmark the operations to determine appropriate costs
  • note: the new functionality does not introduce new events in the contract execution, since the host calls are just simple queries (akin to getting account or contract balance)
• concordium_std:
  • implement appropriate wrapper functions
• Smart contract testing library:
  • implement the new functionality
• Examples:
  • implement example uses of the interface