Publish batch events

[Thomasvdam]

Motivation

Allow showing batches in the explorer.

Explanation of Changes

We'll unpack the validator tree entry on the indexer side. This should make it so we don't have to update the plugin when we add additional signature schemes.

Testing

Run the chain and plugin locally, with an edit in x/tally/keeper/abci.go to publish a fake result every 10th block.

• batch event

{
	"type": "batch",
	"data": {
		"batch_number": "1",
		"block_height": "1",
		"data_result_root": "9c6b2c1b0d0b25a008e6c882cc7b415f309965c72ad2b944ac0931048ca31cd5",
		"validator_root": "c5d2460186f7233c927e7db2dcc703c0e500b653ca82273b7bfad8045d85a470",
		"batch_id": "f58c797327c8db6eb2e616316f33046e4a8f1b17eadc29f461e3002081865f19",
		"proving_medatada": ""
	}
}

• dr-batch-assignment event

{
  "type": "dr-batch-assignment",
  "data": { "dr_id": "10", "batch_number": "3" }
}

• batch-validator-entries event

{
  "type": "batch-validator-entries",
  "data": {
    "batch_number": "2",
    "validator_tree_entries": [
      "67cf8fab95fb00f824c58eb31783f41a847821e805f5e100"
    ]
  }
}

• batch-signatures event

{
  "type": "batch-signatures",
  "data": {
    "batch_number": "8",
    "validator_address": "sedavaloper14n46rclrm86w7ggdwt255a00yaw85gl52mmte6",
    "signatures": "882d87f50547dd460db46e2cb3554e63bfc8b757baf76175dff05befeb7b7e4e0be466f703d763e8f5876d991763a7d508fb84ce5a111c0b3011b9e504df18b8"
  }
}

• module-params event

{
	"type": "module-params",
	"data": {
		"moduleName": "batching",
		"params": { "validator_set_trim_percent": 95 }
	}
}

Related PRs and Issues

Closes: #372

[gluax]

FWIW I recently removed the omitempty on the DataResult type, and I wonder if that's worth doing for some of these other types as well. Doesn't feel like some of them should ever be empty.