Add support for Fantom

[MysticRyuujin]

In a previous PR you added this: CHAIN_FANTOM = 102; // Fantom, https://fantom.foundation/

But these lines were missing. Fantom calls their chain opera sometimes too, so I added opera as an option as well.

[MysticRyuujin]

I assume this, like the previous PR needs to have upstream dependencies fixed?

EDIT: Actually, it looks like this PR worked. I built it and am running:

2021-20-08 20:21:03.277 | INFO  |          Multistream | State of FTM: height=15104576, status=OK/3,SYNCING/1, lag=[0, 0, 0, 9]

[MysticRyuujin]

Nope, something is still wrong with FTM support. It seems to get stuck where the height never increases, even though the nodes are in sync.

[codecov-commenter]

Codecov Report

Merging #103 (feba1b5) into master (64d667a) will decrease coverage by 0.02%. The diff coverage is 33.33%.

@@             Coverage Diff              @@
##             master     #103      +/-   ##
============================================
- Coverage     52.58%   52.55%   -0.03%     
  Complexity      793      793              
============================================
  Files           152      152              
  Lines          5131     5137       +6     
  Branches        747      749       +2     
============================================
+ Hits           2698     2700       +2     
- Misses         2035     2038       +3     
- Partials        398      399       +1     

Impacted Files	Coverage Δ
.../dshackle/upstream/calls/DefaultEthereumMethods.kt	55.14% <0.00%> (-2.15%)	:arrow_down:
...emeraldpay/dshackle/startup/ConfiguredUpstreams.kt	20.68% <100.00%> (+1.10%)	:arrow_up:

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[splix]

Thank you! It seems that I need to check why it stuck. This time I'm not ready for setting up another node, so I'm going to try with their public RPC. Will let you know

[splix]

Ok, so the Fantom doesn't have conception of "Block Difficulty" which Dshackle uses to determine forks/consensus splits. As a result Dshackle cannot figure out if a new block is a really new (i.e., a new head).

It's unclear how to deal with Fantom in this aspect :(