Added the ability to log Flow record collections

[jongpie]

Closes #168 by adding a new class, FlowCollectionLogEntry - this class is very similar to FlowLogEntry and FlowRecordLogEntry, with the only difference that it logs an instance of List<SObject>.

I've also included another class, FlowLogger, that's used for sharing some code for all 3 Flow entry classes. There was previously a LOT of code duplicated between FlowLogEntry and FlowRecordLogEntry - using FlowLogger helps eliminated most of the duplicated code/makes overall maintenance much easier.

[codecov]

Codecov Report

Merging #171 (7e73154) into main (dae9b86) will increase coverage by 0.18%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main     #171      +/-   ##
==========================================
+ Coverage   94.06%   94.24%   +0.18%     
==========================================
  Files          17       19       +2     
  Lines        1971     1965       -6     
==========================================
- Hits         1854     1852       -2     
+ Misses        117      113       -4     

Impacted Files	Coverage Δ
...-logger/main/log-management/classes/LogHandler.cls	99.11% <100.00%> (-0.45%)	⬇️
.../log-management/classes/LogMassDeleteExtension.cls	100.00% <100.00%> (+19.04%)	⬆️
...n/logger-engine/classes/FlowCollectionLogEntry.cls	100.00% <100.00%> (ø)
...logger/main/logger-engine/classes/FlowLogEntry.cls	100.00% <100.00%> (ø)
...a-logger/main/logger-engine/classes/FlowLogger.cls	100.00% <100.00%> (ø)
.../main/logger-engine/classes/FlowRecordLogEntry.cls	100.00% <100.00%> (ø)
...ain/logger-engine/classes/LogEntryEventBuilder.cls	94.31% <100.00%> (+0.28%)	⬆️

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