Add RPC support to Agora client

[mkykadir]

also includes some fixes

see each commit

Fixes #3310

[codecov[bot]]

Codecov Report

Merging #3311 (da682b8) into v0.x.x (37d16af) will decrease coverage by 0.64%. The diff coverage is 75.00%.

@@            Coverage Diff             @@
##           v0.x.x    #3311      +/-   ##
==========================================
- Coverage   88.44%   87.79%   -0.65%     
==========================================
  Files         165      164       -1     
  Lines       17082    16975     -107     
==========================================
- Hits        15108    14904     -204     
- Misses       1974     2071      +97     

Flag	Coverage Δ
integration	?
unittests	87.79% <75.00%> (+0.22%)	:arrow_up:

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
source/agora/network/RPC.d	2.02% <ø> (-15.16%)	:arrow_down:
source/agora/cli/client/SendTxProcess.d	47.61% <50.00%> (-0.58%)	:arrow_down:
source/agora/cli/client/Common.d	83.33% <100.00%> (+8.33%)	:arrow_up:
source/agora/node/Runner.d	0.00% <0.00%> (-55.56%)	:arrow_down:
source/scpd/types/Stellar_SCP.d	68.99% <0.00%> (-30.24%)	:arrow_down:
source/agora/network/VibeManager.d	1.44% <0.00%> (-20.29%)	:arrow_down:
source/agora/node/Config.d	64.96% <0.00%> (-10.22%)	:arrow_down:
source/agora/utils/Log.d	57.50% <0.00%> (-5.00%)	:arrow_down:
source/agora/node/Registry.d	77.29% <0.00%> (-2.09%)	:arrow_down:
... and 10 more

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