feat: add Bytes support for transaction iteration in ConsensusEvent and its ancestors

[IvanKavaldzhiev]

Description:
This PR enhances partially ISSTestingTool to work with the incoming transaction representation of Bytes only. Additional filtering and changes should be added when SwirldState API is adapted to handle the new transaction type.

To do so, ConsensusEvent was adapted to return such bytes, since ISSTestingTool and most of the platform testing apps use this interface when handling rounds/transactions.

Additionally, some of the methods connected with the current EventTransaction protobuf wrapper and checks for system transactions are marked as Deprecated, so that they are adapted for the incoming changes of using only Bytes for transactions.

Related issue(s):

Fixes #16840

Notes for reviewer:
The current logic for ISSTestingTool is working as expected.
The new transaction format with Bytes is not tested, since protobuf changes are not adapted and the SwirldState API changes including registering callback for getting back system transactions is not done yet.

Checklist

• Documented (Code comments, README, etc.)
• [] Tested (unit, integration, etc.)

[codecov]

Codecov Report

Attention: Patch coverage is 51.28205% with 19 lines in your changes missing coverage. Please review.

Project coverage is 67.29%. Comparing base (70c450e) to head (f71ea96).
Report is 9 commits behind head on main.

Files with missing lines	Patch %	Lines
...java/com/swirlds/demo/iss/ISSTestingToolState.java	62.50%	11 Missing and 1 partial ⚠️
...latform/system/transaction/TransactionWrapper.java	0.00%	5 Missing ⚠️
.../java/com/swirlds/demo/iss/ISSTestingToolMain.java	0.00%	1 Missing ⚠️
...n/java/com/swirlds/platform/system/SwirldMain.java	0.00%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##               main   #16844      +/-   ##
============================================
+ Coverage     67.24%   67.29%   +0.04%     
- Complexity    21991    22008      +17     
============================================
  Files          2583     2583              
  Lines         96307    96334      +27     
  Branches      10054    10056       +2     
============================================
+ Hits          64763    64828      +65     
+ Misses        27839    27795      -44     
- Partials       3705     3711       +6     

Files with missing lines	Coverage Δ
...irlds/platform/system/transaction/Transaction.java	50.00% <ø> (ø)
.../java/com/swirlds/demo/iss/ISSTestingToolMain.java	33.33% <0.00%> (+33.33%)	⬆️
...n/java/com/swirlds/platform/system/SwirldMain.java	0.00% <0.00%> (ø)
...latform/system/transaction/TransactionWrapper.java	60.00% <0.00%> (-12.00%)	⬇️
...java/com/swirlds/demo/iss/ISSTestingToolState.java	31.25% <62.50%> (+31.25%)	⬆️

... and 5 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%)	✅ 53.85%

Coverage variation details

	Coverable lines	Covered lines	Coverage
Common ancestor commit (70c450e)	96090	68316	71.10%
Head commit (f71ea96)	96117 (+27)	68387 (+71)	71.15% (+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 (#16844)	39	21	53.85%

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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_{Codacy stopped sending the deprecated coverage status on June 5th, 2024. Learn more}

[rbarkerSL]

LGTM

[poulok]

Approved, assuming the ISS Testing Tool nightly tests pass.