add extra fields on prepare transaction

[AdoAdoAdo]

Reasoning behind the pull request

• missing fields in the transaction response for guarded transactions

Proposed changes

• added the missing fields

Testing procedure

• send guarded transactions and check for the fields on observer and proxy

Pre-requisites

Based on the Contributing Guidelines the PR author and the reviewers must check the following requirements are met:

• was the PR targeted to the correct branch?
• if this is a larger feature that probably needs more than one PR, is there a feat branch created?
• if this is a feat branch merging, do all satellite projects have a proper tag inside go.mod?

[codecov]

Codecov Report

Patch coverage: 53.84% and project coverage change: -0.01 ⚠️

Comparison is base (819d47d) 77.59% compared to head (668bc81) 77.59%.

❗ Current head 668bc81 differs from pull request most recent head b1d3b3a. Consider uploading reports for the commit b1d3b3a to get more accurate results

Additional details and impacted files

@@              Coverage Diff              @@
##           rc/v1.5.0    #5162      +/-   ##
=============================================
- Coverage      77.59%   77.59%   -0.01%     
=============================================
  Files            654      654              
  Lines          85943    85952       +9     
=============================================
+ Hits           66685    66691       +6     
- Misses         14059    14060       +1     
- Partials        5199     5201       +2     

Impacted Files	Coverage Δ
node/external/transactionAPI/unmarshaller.go	88.40% <53.84%> (-3.85%)	⬇️

... and 3 files with indirect coverage changes

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[gabi-vuls]

System test passed .
@@ Log scanner @@

missing-api-transaction-fields

================================================================================

• Known Warnings 6
• New Warnings 2
• Known Errors 0
• New Errors 0
• Panics 0
  ================================================================================
• block hash does not match 1558
• wrong nonce in block 469
• miniblocks does not match 0
• num miniblocks does not match 0
• miniblock hash does not match 0
• block bodies does not match 0
• receipts hash missmatch 0
  ================================================================================
• No jailed nodes on the thestnet
  ================================================================================