Get proofs for MMR

curl --request GET \
  --url https://rs-indexer.api.herodotus.cloud/accumulators/proofs

{
  "data": [
    {
      "meta": {
        "contract_address": "<string>",
        "mmr_id": "<string>",
        "mmr_peaks": [
          "<string>"
        ],
        "mmr_root": "<string>",
        "mmr_size": 123
      },
      "proofs": [
        {
          "block_number": 123,
          "element_hash": "<string>",
          "element_index": 123,
          "rlp_block_header": {
            "String": "<string>"
          },
          "siblings_hashes": [
            "<string>"
          ]
        }
      ]
    }
  ]
}