Verification Node documentation

[yhassanzadeh13]

This PR adds a comprehensive architectural overview of the verification node.

[codecov-commenter]

Codecov Report

Merging #4528 (240507a) into master (2528190) will decrease coverage by 1.81%.
The diff coverage is 48.03%.

@@            Coverage Diff             @@
##           master    #4528      +/-   ##
==========================================
- Coverage   56.25%   54.44%   -1.81%     
==========================================
  Files         653      914     +261     
  Lines       64699    85158   +20459     
==========================================
+ Hits        36396    46366    +9970     
- Misses      25362    35220    +9858     
- Partials     2941     3572     +631     

Flag	Coverage Δ
unittests	54.44% <48.03%> (-1.81%)	⬇️

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

Impacted Files	Coverage Δ
cmd/scaffold.go	14.78% <0.00%> (+0.02%)	⬆️
module/metrics/herocache.go	0.00% <0.00%> (ø)
module/metrics/network.go	0.00% <0.00%> (ø)
module/metrics/noop.go	0.00% <0.00%> (ø)
network/p2p/inspector/internal/cache/cache.go	64.70% <ø> (ø)
network/p2p/middleware/middleware.go	1.71% <0.00%> (ø)
network/p2p/p2pbuilder/libp2pNodeBuilder.go	0.00% <0.00%> (ø)
utils/unittest/unittest.go	7.48% <0.00%> (-0.12%)	⬇️
network/netconf/flags.go	26.37% <50.00%> (ø)
network/p2p/tracer/internal/rpc_send_entity.go	77.77% <77.77%> (ø)
... and 4 more

... and 255 files with indirect coverage changes

[zhangchiqing]

Nice write up!