chore: Add factory method for StateSignatureTransaction

[netopyr]

Description:

This PR adds an implementation of SwirldMain.encodeSystemTransaction() in Hedera.

Related issue(s):

Fixes #17073

Notes for reviewer:

Checklist

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

[codacy-production]

Coverage summary from Codacy

See diff coverage on Codacy

Coverage variation	Diff coverage
✅ +0.07% (target: -1.00%)	✅ 0.00%

Coverage variation details

	Coverable lines	Covered lines	Coverage
Common ancestor commit (3e8fa1f)	97675	71128	72.82%
Head commit (4aabb91)	97978 (+303)	71413 (+285)	72.89% (+0.07%)

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 (#17447)	14	0	0.00%

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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[codecov]

Codecov Report

Attention: Patch coverage is 0% with 14 lines in your changes missing coverage. Please review.

Project coverage is 68.98%. Comparing base (3e8fa1f) to head (4aabb91).
Report is 6 commits behind head on main.

Files with missing lines	Patch %	Lines
...-app/src/main/java/com/hedera/node/app/Hedera.java	0.00%	14 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##               main   #17447      +/-   ##
============================================
+ Coverage     68.91%   68.98%   +0.06%     
- Complexity    22667    22770     +103     
============================================
  Files          2613     2619       +6     
  Lines         97892    98282     +390     
  Branches      10156    10184      +28     
============================================
+ Hits          67463    67796     +333     
- Misses        26613    26658      +45     
- Partials       3816     3828      +12     

Files with missing lines	Coverage Δ
...-app/src/main/java/com/hedera/node/app/Hedera.java	51.25% <0.00%> (-1.86%)	⬇️

... and 45 files with indirect coverage changes

[iwsimon]

LGTM, thanks @netopyr

[Neeharika-Sompalli]

LGTM! Thanks @netopyr

[tinker-michaelj]

Afaict the transactionValidDuration and transactionID#transactionValidStart fields have only very minimal verification here during PreHandleWorkflow and we could set them here to,

• Duration.DEFAULT
• Timestamp.DEFAULT

respectively. Unless we want to change that, I would suggest using these DEFAULT values to (1) save a few bytes and (2) avoid implying to the reader taht these transactions get deeper validation downstream.

[netopyr]

Ah, good point. For some reason, I was convinced we would check if the time interval was valid. But we cannot do it at this point, of course. I will update the code. Thanks!