VNP-031 Batch update of network parameters

Batch update of network parameters.

Change parameter governance.proposal.freeform.requiredParticipation from 0.09 to 0.025.
Change parameter governance.proposal.asset.requiredParticipation from 0.09 to 0.025.
Change parameter governance.proposal.updateAsset.requiredParticipation from 0.09 to 0.025.

This proposal update the previously stated network parameter from 9% to 2.5%. Similar parameters for market creation and update market were updated in the past, by doing so we are expecting the proposals to go through the vote process with less friction.

Full Proposal JSON:

{
  "batchProposalSubmission": {
    "rationale": {
      "title": "VNP-031 - Update required participation for some governance proposals",
      "description": "The free form, new asset and update asset proposal currently require 9% of participation to the vote to pass. This proposal recommend to reduce this to 2.5%. [VNP-029](https://community.vega.xyz/t/vnp-031-batch-update-of-network-parameters/4492)"
    },
    "terms": {
      "closingTimestamp": "0",
      "changes": [
        {
          "enactmentTimestamp": "0",
          "updateNetworkParameter": {
            "changes": {
              "key": "governance.proposal.freeform.requiredParticipation",
              "value": "0.025"
            }
          }
        },
        {
          "enactmentTimestamp": "0",
          "updateNetworkParameter": {
            "changes": {
              "key": "governance.proposal.asset.requiredParticipation",
              "value": "0.025"
            }
          }
        },
        {
          "enactmentTimestamp": "0",
          "updateNetworkParameter": {
            "changes": {
              "key": "governance.proposal.updateAsset.requiredParticipation",
              "value": "0.025"
            }
          }
        }
      ]
    }
  }
}

Note: timestamps will be updated before the submission.

Seems reasonable. We only need 3% to change the network parameters so 9% for assets is unreasonably high.