Add first step of FireFly Transaction Manager support - separate URL for submit

[peterbroadhurst]

• Adds Hard Hat config for help deploying the FireFly batch pin contract to public chains
• Allows an extra fftm config section alongside ethconnect in the ethereum config
  • Currently only used for SendTransaction when set (FFTM doesn't do events ... yet)
• Allows you to specify a fromBlock for the ethconnect event listener for the batch pin contract

[codecov-commenter]

Codecov Report

Merging #751 (c68b587) into main (fab9e31) will increase coverage by 0.01%.
The diff coverage is 100.00%.

@@             Coverage Diff             @@
##             main      #751      +/-   ##
===========================================
+ Coverage   99.98%   100.00%   +0.01%     
===========================================
  Files         323       323              
  Lines       20181     20191      +10     
===========================================
+ Hits        20178     20191      +13     
+ Misses          2         0       -2     
+ Partials        1         0       -1     

Impacted Files	Coverage Δ
internal/blockchain/ethereum/config.go	100.00% <100.00%> (ø)
internal/blockchain/ethereum/ethereum.go	100.00% <100.00%> (ø)
internal/blockchain/ethereum/eventstream.go	100.00% <100.00%> (ø)
pkg/wsclient/wsclient.go	100.00% <0.00%> (+1.63%)	⬆️

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