feat: cli: set current network version from params

[travisperson]

allows automation to correctly set the network version for the currently built network with no variable inputs.

Related Issues

When creating a network, by default, the latest network version (NewestNetworkVersion) is used in the genesis network template file. If the network does not start on the default latest network version (eg has upgrade epochs set / GenesisNetworkVersion is smaller), the network will fail to startup due to invalid network versions.

Proposed Changes

Add a flag that will use the build param GenesisNetworkVersion to set the network version. This ensures that the genesis network version always matches the network being built (if lotus-seed is built with the network flags).

Additional Info

Checklist

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• All commits have a clear commit message.
• The PR title is in the form of of <PR type>: <area>: <change being made>
  • example: fix: mempool: Introduce a cache for valid signatures
  • PR type: fix, feat, INTERFACE BREAKING CHANGE, CONSENSUS BREAKING, build, chore, ci, docs,perf, refactor, revert, style, test
  • area: api, chain, state, vm, data transfer, market, mempool, message, block production, multisig, networking, paychan, proving, sealing, wallet, deps
• This PR has tests for new functionality or change in behaviour
• If new user-facing features are introduced, clear usage guidelines and / or documentation updates should be included in https://lotus.filecoin.io or Discussion Tutorials.
• CI is green