Fix Scheduled Changes behaviour

[ortyomka]

Signed-off-by: ortyomka iurin.art@gmail.com

Referenced issues

#1269

Description of the Change

Add check for overlapping scheduled changes
Fix Set ID numeration (now we assume, that second planned will based on activated previous, so we activate it)

Benefits

Correct work of Authority Manager

Possible Drawbacks

Lookup past authority set, ignore force changes. Maybe it's wrong

[codecov]

Codecov Report

Merging #1317 (2609e79) into master (0041a0b) will increase coverage by 0.03%.
The diff coverage is 38.09%.

@@            Coverage Diff             @@
##           master    #1317      +/-   ##
==========================================
+ Coverage   24.16%   24.19%   +0.03%     
==========================================
  Files         627      627              
  Lines       23421    23440      +19     
  Branches    12245    12258      +13     
==========================================
+ Hits         5660     5672      +12     
+ Misses      12492    12487       -5     
- Partials     5269     5281      +12     

Impacted Files	Coverage Δ
...onsensus/authority/impl/authority_manager_impl.cpp	21.73% <38.09%> (+0.87%)	⬆️
core/api/transport/impl/ws/ws_listener_impl.cpp	40.27% <0.00%> (-2.78%)	⬇️
core/metrics/impl/prometheus/handler_impl.cpp	28.57% <0.00%> (+2.04%)	⬆️
core/consensus/authority/impl/schedule_node.cpp	69.44% <0.00%> (+2.77%)	⬆️
core/metrics/impl/session_impl.cpp	45.83% <0.00%> (+8.33%)	⬆️

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