Add support for evmconnect

[nguyer]

This PR adds support for evmconnect and chosing between it and ethconnect (still the default) with the new -c, --blockchain-connector flag.

It also moves logging related items to a context which is passed throughout the CLI code, and it creates a new interface for blockchain connectors.

Right now a BlockchainProvider creates the blockchain connector instance, but I feel like it should probably be the other way around in the future. That's a refactor for another day, as it is quite a disruptive code change, with no tangible benefit to the end user (only code maintainability).

[peterbroadhurst]

Just a note that this PR contains a fix for a timing issue, to do with the IPFS container being terminated during the docker-compose down that happens after installing the contract, at a point that the docker orchestration script of IPFS cannot recover from. The symptoms are provided below for search, as we believe this could happen in a V1.0 stack.

The fix was to add a healthcheck to the IPFS container, and then a service-healthy check on the firefly_core container, so that the initial docker-compose up does not complete until IPFS is fully started.

Changing user to ipfs
ipfs version 0.10.0
generating ED25519 keypair...done
peer identity: 12D3KooWKwJsB6rX8EJ95btpsMvs5Soq6DraPNbPn8xsdPwbve9V
initializing IPFS node at /data/ipfs
to get started, enter:

        ipfs cat /ipfs/QmQPeNsJPyVWPFDVHb77w8G42Fvo15z4bG2X8D2GhfbSXc/readme

Changing user to ipfs
ipfs version 0.10.0
Found IPFS fs-repo at /data/ipfs
Initializing daemon...
go-ipfs version: 0.10.0-64b532f
Repo version: 11
System version: amd64/linux
Golang version: go1.16.7
2022-08-08T03:55:13.585Z        ERROR   p2p-config      config/config.go:107    tried to create a libp2p node with no Private Network Protector but usage of Private Networks is forced by the enviroment
2022-08-08T03:55:13.624Z        ERROR   cmd/ipfs        ipfs/daemon.go:422      error from node construction: could not build arguments for function "github.com/ipfs/go-ipfs/core/node".PeerWith.func1 (/go-ipfs/core/node/peering.go:29): failed to build *peering.PeeringService: could not build arguments for function "github.com/ipfs/go-ipfs/core/node".Peering (/go-ipfs/core/node/peering.go:14): failed to build host.Host: received non-nil error from function "github.com/ipfs/go-ipfs/core/node/libp2p".Host (/go-ipfs/core/node/libp2p/host.go:40): privnet: private network was not configured but is enforced by the environment

Error: could not build arguments for function "github.com/ipfs/go-ipfs/core/node".PeerWith.func1 (/go-ipfs/core/node/peering.go:29): failed to build *peering.PeeringService: could not build arguments for function "github.com/ipfs/go-ipfs/core/node".Peering (/go-ipfs/core/node/peering.go:14): failed to build host.Host: received non-nil error from function "github.com/ipfs/go-ipfs/core/node/libp2p".Host (/go-ipfs/core/node/libp2p/host.go:40): privnet: private network was not configured but is enforced by the environment

[peterbroadhurst]

This is great. Like the change to passing the context included in this, and the neat way you've done the refactor around making the connector selectable.

[peterbroadhurst]

I note the ERC-1155 support is currently failing with Error: Method '<constructor>': Requires 1 args (supplied=0)