devmode: Allow DevMode + FollowMode configurations.

[winder]

Summary

Allow multi-node devmode private networks with one DevMode relay and one or more FollowMode followers.

This is required to support Indexer running against a DevMode network.

Note: added DisallowUnknownFields to the JSON decoder so that we would fail to create a private network if one of the configurations is unknown.

Test Plan

New unit tests.

In the future Sandbox would continuously integration test this configuration.

Manual test with the following configuration:

{
  "Genesis": {
    "LastPartKeyRound": 3000,
    "NetworkName": "tbd",
    "Wallets": [
      {
        "Name": "Wallet1",
        "Stake": 100,
        "Online": true
      }
    ],
    "DevMode": true
  },
  "Nodes": [
    {
      "Name": "Primary",
      "IsRelay": true,
      "Wallets": [
        {
          "Name": "Wallet1",
          "ParticipationOnly": false
        }
      ]
    },
    {
      "Name": "Follower",
      "Wallets": [],
      "ConfigJSONOverride": "{\"EnableFollowMode\":true,\"CatchupBlockValidateMode\":3}"
    }
  ]
}

[codecov]

Codecov Report

Merging #5157 (95fce85) into master (a688c23) will increase coverage by 0.05%.
The diff coverage is 84.00%.

@@            Coverage Diff             @@
##           master    #5157      +/-   ##
==========================================
+ Coverage   53.44%   53.50%   +0.05%     
==========================================
  Files         431      431              
  Lines       54364    54378      +14     
==========================================
+ Hits        29056    29093      +37     
+ Misses      23053    23034      -19     
+ Partials     2255     2251       -4     

Impacted Files	Coverage Δ
node/node.go	4.11% <0.00%> (+0.01%)	⬆️
netdeploy/networkTemplate.go	39.56% <86.95%> (+11.69%)	⬆️
node/follower_node.go	26.08% <100.00%> (+1.22%)	⬆️
data/transactions/verify/streamverifier.go	92.30% <0.00%> (-1.78%)	⬇️
ledger/testing/randomAccounts.go	56.26% <0.00%> (-0.62%)	⬇️
network/wsNetwork.go	65.43% <0.00%> (+0.27%)	⬆️
network/wsPeer.go	67.81% <0.00%> (+1.83%)	⬆️
catchup/service.go	70.82% <0.00%> (+1.88%)	⬆️

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[shiqizng]

why do we need to run a relay node for dev mode?

[winder]

If there's a follower node, it needs to connect to the relay.

[cce]

Builtin has https://pkg.go.dev/encoding/json#Decoder.DisallowUnknownFields for json to reject unknown fields

[cce]

When you enable networking here, it will cause the network to look for peers to connect to, right? What are the network bootstrap URLs used by dev mode users ...? I am not clear on how dev mode networks are named or whether they would find peers when networking is enabled.

[cce]

It might make more sense to move this toggle to config.go and still have it be the default behavior for devmode, unless you were explicitly setting DisableNetwork=false? IDK. Otherwise if someone named their dev mode network name "testnet", "devnet", "betanet", or "mainnet" it would start connecting to relays