[fix] #1811: added tests and checks to dedup trusted peer keys.

[appetrosyan]

Description of the Change

Added more sanity checks to the configuration reading process.

Issue

Closes #1811

Benefits

More safety.

Possible Drawbacks

The configuration.json file is read twice.

[codecov]

Codecov Report

Merging #1844 (fdf0c26) into iroha2-dev (204163b) will increase coverage by 0.37%.
The diff coverage is 95.16%.

@@              Coverage Diff               @@
##           iroha2-dev    #1844      +/-   ##
==============================================
+ Coverage       78.10%   78.47%   +0.37%     
==============================================
  Files             148      148              
  Lines           21511    21555      +44     
==============================================
+ Hits            16801    16916     +115     
+ Misses           4710     4639      -71     

Impacted Files	Coverage Δ
core/src/sumeragi/mod.rs	85.21% <92.30%> (+3.67%)	⬆️
core/src/config.rs	100.00% <100.00%> (+4.65%)	⬆️
crypto/src/lib.rs	83.02% <100.00%> (+0.32%)	⬆️
core/src/block_sync.rs	88.67% <0.00%> (-1.26%)	⬇️
p2p/src/peer.rs	82.26% <0.00%> (-0.89%)	⬇️
data_model/src/expression.rs	70.77% <0.00%> (-0.27%)	⬇️
data_model/src/lib.rs	69.14% <0.00%> (+0.36%)	⬆️
core/src/sumeragi/network_topology.rs	95.83% <0.00%> (+4.16%)	⬆️
... and 2 more

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