fix: fixes debug_traceBlockByNumber response to not be null for a transaction with no internal calls

[simzzz]

Description

When calling debug_traceBlockByNumber for a block, and some transaction from the block hasn't made any calls, then null would be returned for that transaction. The result should be the root call object with an empty calls array instead of null. We build the root object from the same fields in the transaction object that would back the root call: from, to, value, gas, gasUsed, input, output/error (from transactionsResponse) and calls: [].

• When actions are present, we use actionsResponse[0].call_type for type. When actions are absent, we infer type as "CALL" if to exists, otherwise "CREATE". Everything else matches the root call data.

Related issue(s)

Fixes #4386

Testing Guide

1. Call debug_traceBlockByNumber for a block that contains a transaction with no calls
2. Make sure result is an object with an empty calls array instead of null

Changes from original design (optional)

N/A

Additional work needed (optional)

N/A

Checklist

• I've assigned an assignee to this PR and related issue(s) (if applicable)
• I've assigned a label to this PR and related issue(s) (if applicable)
• I've assigned a milestone to this PR and related issue(s) (if applicable)
• I've updated documentation (code comments, README, etc. if applicable)
• I've done sufficient testing (unit, integration, etc.)

[github-actions]

Test Results

 20 files  ±0  265 suites  ±0   20m 2s ⏱️ - 7m 41s
761 tests ±0  756 ✅ +1  5 💤 ±0  0 ❌  - 1 
777 runs  ±0  772 ✅ +1  5 💤 ±0  0 ❌  - 1 

Results for commit 07789e2. ± Comparison against base commit 256d146.

♻️ This comment has been updated with latest results.

[codecov]

Codecov Report

❌ Patch coverage is 82.35294% with 6 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
packages/relay/src/lib/debug.ts	82.35%	6 Missing ⚠️

@@            Coverage Diff             @@
##             main    #4440      +/-   ##
==========================================
+ Coverage   96.13%   96.20%   +0.07%     
==========================================
  Files         121      121              
  Lines       19941    19973      +32     
  Branches     1750     1760      +10     
==========================================
+ Hits        19170    19216      +46     
+ Misses        749      735      -14     
  Partials       22       22              

Flag	Coverage Δ
config-service	98.80% <ø> (ø)
relay	91.21% <82.35%> (-0.02%)	⬇️
server	88.82% <ø> (ø)
ws-server	98.27% <ø> (+1.30%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
packages/relay/src/lib/debug.ts	98.65% <82.35%> (-0.72%)	⬇️

... and 3 files with indirect coverage changes

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