rpcdaemon: wrong reward values in response for eth_feeHistory API

[Sixtysixter]

Executing the following request

{
  "jsonrpc": "2.0",
  "method": "eth_feeHistory",
  "params": [
    "0x2",
    "latest",
    [1,5,95,100]
  ],
  "id": 1
}

the resulting reward arrays in silk response differs from the one provided by erigon.

The problem is due to the different sort algorithm used in STL C++ and in Go, so the same reward/gas_used list produces 2 different sorted list, and the following threshold gas used evaluation in silk differs from the erigon one.

Silk sorted list

  INFO [04-12|13:55:38.683 UTC] [asio_ctx_s6] i: 0, itr->reward: 0, itr->gas_used: 21'000
  INFO [04-12|13:55:38.683 UTC] [asio_ctx_s6] i: 1, itr->reward: 0, itr->gas_used: 269'277
  INFO [04-12|13:55:38.683 UTC] [asio_ctx_s6] i: 2, itr->reward: 0, itr->gas_used: 286'892
  INFO [04-12|13:55:38.683 UTC] [asio_ctx_s6] i: 3, itr->reward: 0, itr->gas_used: 248'236
  INFO [04-12|13:55:38.683 UTC] [asio_ctx_s6] i: 4, itr->reward: 91'240, itr->gas_used: 158'746
  INFO [04-12|13:55:38.683 UTC] [asio_ctx_s6] i: 5, itr->reward: 3'153'134, itr->gas_used: 69'819
  INFO [04-12|13:55:38.683 UTC] [asio_ctx_s6] i: 6, itr->reward: 4'099'074, itr->gas_used: 60'940
  INFO [04-12|13:55:38.683 UTC] [asio_ctx_s6] i: 7, itr->reward: 4'729'701, itr->gas_used: 105'848
  INFO [04-12|13:55:38.683 UTC] [asio_ctx_s6] i: 8, itr->reward: 4'729'701, itr->gas_used: 49'752
  INFO [04-12|13:55:38.683 UTC] [asio_ctx_s6] i: 9, itr->reward: 4'729'701, itr->gas_used: 49'752
  INFO [04-12|13:55:38.683 UTC] [asio_ctx_s6] i: 10, itr->reward: 14'357'780, itr->gas_used: 43'121
.....

Erigon sorted list

  INFO[04-12|15:43:44.096] AFTER sort                               i=0 reward=0 GasUsed=248231
  INFO[04-12|15:43:44.096] AFTER sort                               i=1 reward=0 GasUsed=186119
  INFO[04-12|15:43:44.096] AFTER sort                               i=2 reward=0 GasUsed=21000
  INFO[04-12|15:43:44.096] AFTER sort                               i=3 reward=0 GasUsed=347976
  INFO[04-12|15:43:44.096] AFTER sort                               i=4 reward=0 GasUsed=283841
  INFO[04-12|15:43:44.096] AFTER sort                               i=5 reward=0 GasUsed=21000
  INFO[04-12|15:43:44.096] AFTER sort                               i=6 reward=3153134 GasUsed=525877
  INFO[04-12|15:43:44.096] AFTER sort                               i=7 reward=3153134 GasUsed=41309
  INFO[04-12|15:43:44.096] AFTER sort                               i=8 reward=3153134 GasUsed=86904
  INFO[04-12|15:43:44.096] AFTER sort                               i=9 reward=4729701 GasUsed=55636
  INFO[04-12|15:55:38.927] AFTER sort                               i=10 reward=14357780 GasUsed=43121
...