refactor: use preferred headlong API when decoding RLP

[david-bakin-sl]

Description:

Headlong's RLPItem.asBigInt preferred over asByte/asInt/asLong.

Related issue(s):

Fixes #17523

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
✅ +0.00% (target: -1.00%)	✅ 100.00%

Coverage variation details

	Coverable lines	Covered lines	Coverage
Common ancestor commit (2b2c647)	98068	71447	72.85%
Head commit (4c95659)	98079 (+11)	71458 (+11)	72.86% (+0.00%)

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 (#17525)	20	20	100.00%

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 80.00000% with 4 lines in your changes missing coverage. Please review.

Project coverage is 68.94%. Comparing base (2b2c647) to head (4c95659).
Report is 6 commits behind head on main.

Files with missing lines	Patch %	Lines
...hedera/node/app/hapi/utils/ethereum/EthTxData.java	80.00%	0 Missing and 4 partials ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##               main   #17525      +/-   ##
============================================
- Coverage     68.94%   68.94%   -0.01%     
- Complexity    22757    22760       +3     
============================================
  Files          2619     2619              
  Lines         98285    98296      +11     
  Branches      10185    10189       +4     
============================================
+ Hits          67761    67768       +7     
  Misses        26687    26687              
- Partials       3837     3841       +4     

Files with missing lines	Coverage Δ
...hedera/node/app/hapi/utils/ethereum/EthTxData.java	84.94% <80.00%> (-1.34%)	⬇️

[lukelee-sl]

LGTM

[lukelee-sl]

LGTM

[kimbor]

lgtm!