refactor!: didcomm module

[genaris]

Initial work on extracting DIDComm out of core. For the moment, all features are still present on core package, but moved into an internal "didcomm" module that eventually will be extracted along other DIDcomm dependent modules, such as proofs and credentials.

All DIDComm-related fields in AgentConfig were moved to DidCommModuleConfig. As such, some DIDComm-related Agent API methods such as the ones for transport and feature registration are now part of DIDComm module API (for example, agent.didcomm.features or agent.didcomm.registerOutboundTransport).

Lots of TODO:

• Move all DIDComm related tests to their corresponding module
• Remove Wallet interface dependency on DIDComm types, probably by removing pack and unpack methods and make them part of another kind of service (which can be also owned by the module that implements the wallet, like AskarModule)
• Define a new way to register features and message handlers, since currently we do everything at module.register() and we need to ensure that DIDComm module and its objects have been registered
• Create separate modules for didcomm, proofs, credentials and basic-messages

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