Feat/freeze account

[AdoAdoAdo]

This feature adds improved account security for which users can opt in. To enable account freezing, the user first needs to set a guardian address, and that guardian address needs to become active (there is a delay of 20 epochs). A frozen account can only have its transactions processed if co-signed by the guardian account (the only exception is the SetGuardian transaction, which can be either co-signed or regular). Changing the guardian is possible, either immediately if the setGuardian transaction is co-signed by the active guardian, or with the same 20 epochs delay otherwise.

[codecov-commenter]

Codecov Report

Patch coverage: 85.71% and project coverage change: +0.01 :tada:

Comparison is base (ab1c054) 77.00% compared to head (099f108) 77.01%.

:exclamation: Current head 099f108 differs from pull request most recent head a430d16. Consider uploading reports for the commit a430d16 to get more accurate results

Additional details and impacted files

@@              Coverage Diff              @@
##           rc/v1.5.0    #4106      +/-   ##
=============================================
+ Coverage      77.00%   77.01%   +0.01%     
=============================================
  Files            650      651       +1     
  Lines          85470    85920     +450     
=============================================
+ Hits           65813    66171     +358     
- Misses         14476    14547      +71     
- Partials        5181     5202      +21     

Impacted Files	Coverage Δ
factory/bootstrap/bootstrapComponentsHandler.go	57.89% <0.00%> (-6.82%)	:arrow_down:
process/economics/builtInFunctionsCost.go	55.33% <0.00%> (-3.43%)	:arrow_down:
...r/evictionWaitingList/memoryEvictionWaitingList.go	90.52% <ø> (ø)
state/userAccount.go	87.32% <0.00%> (-5.22%)	:arrow_down:
process/smartContract/builtInFunctions/factory.go	83.33% <33.33%> (-2.64%)	:arrow_down:
process/transaction/metaProcess.go	73.86% <33.33%> (+3.07%)	:arrow_up:
process/transaction/shardProcess.go	72.26% <33.33%> (-0.47%)	:arrow_down:
common/enablers/epochFlags.go	92.11% <50.00%> (-0.62%)	:arrow_down:
factory/bootstrap/bootstrapComponents.go	72.19% <60.00%> (-0.34%)	:arrow_down:
process/economics/economicsData.go	71.77% <71.08%> (+1.29%)	:arrow_up:
... and 29 more

... and 2 files with indirect coverage changes

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