feat: migrate event serialization to protobuf

[lpetrovic05]

closes #15205
closes #15202

[codecov]

Codecov Report

Attention: Patch coverage is 90.00000% with 6 lines in your changes missing coverage. Please review.

Project coverage is 58.17%. Comparing base (7a4616b) to head (f87e956).
Report is 17 commits behind head on develop.

Files with missing lines	Patch %	Lines
.../platform/event/preconsensus/PcesFileIterator.java	54.54%	3 Missing and 2 partials ⚠️
...a/com/swirlds/platform/system/events/CesEvent.java	83.33%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@              Coverage Diff              @@
##             develop   #15417      +/-   ##
=============================================
- Coverage      58.22%   58.17%   -0.06%     
+ Complexity     21573    21556      -17     
=============================================
  Files           2779     2780       +1     
  Lines         109151   109117      -34     
  Branches       11163    11163              
=============================================
- Hits           63554    63478      -76     
- Misses         41738    41778      +40     
- Partials        3859     3861       +2     

Files with missing lines	Coverage Δ
...common/io/streams/SerializableDataInputStream.java	85.96% <100.00%> (+1.49%)	⬆️
...ommon/io/streams/SerializableDataOutputStream.java	66.25% <100.00%> (+0.86%)	⬆️
...wirlds/platform/event/EventSerializationUtils.java	75.00% <100.00%> (-12.86%)	⬇️
...java/com/swirlds/platform/event/PlatformEvent.java	89.18% <100.00%> (-1.17%)	⬇️
...rm/event/preconsensus/PcesBirthRoundMigration.java	93.24% <100.00%> (ø)
...s/platform/event/preconsensus/PcesFileVersion.java	100.00% <100.00%> (ø)
...s/platform/event/preconsensus/PcesMutableFile.java	86.48% <100.00%> (ø)
...swirlds/platform/gossip/shadowgraph/SyncUtils.java	80.70% <100.00%> (ø)
.../swirlds/platform/system/events/EventMetadata.java	98.18% <100.00%> (-0.10%)	⬇️
.../swirlds/platform/system/events/UnsignedEvent.java	63.63% <100.00%> (ø)
... and 4 more

... and 12 files with indirect coverage changes

[codacy-production]

Coverage summary from Codacy

See diff coverage on Codacy

Coverage variation	Diff coverage
✅ -0.05% (target: -1.00%)	✅ 95.00%

Coverage variation details

	Coverable lines	Covered lines	Coverage
Common ancestor commit (7a4616b)	108968	67303	61.76%
Head commit (f87e956)	108934 (-34)	67229 (-74)	61.72% (-0.05%)

Coverage variation is the difference between the coverage for the head and common ancestor commits of the pull request branch: <coverage of head commit> - <coverage of common ancestor commit>

Diff coverage details

	Coverable lines	Covered lines	Diff coverage
Pull request (#15417)	60	57	95.00%

Diff coverage is the percentage of lines that are covered by tests out of the coverable lines that the pull request added or modified: <covered lines added or modified>/<coverable lines added or modified> * 100%

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