feat: add configurable SDK_LOG_LEVEL for enhanced SDK logging

[quiet-node]

Description

This PR introduces configurable SDK logging to help debug consensus node timeouts on mainnet. It adds a new SDK_LOG_LEVEL environment variable that allows independent control of the Hedera SDK's logging level, separate from the global application log level. This enables fine-tuned debugging of SDK operations without flooding the main application logs.

The implementation creates a child logger from the global logger that inherits parent properties while using the SDK-specific log level configuration.

Log Volume Impact

Additional logs per eth_sendRawTransaction transaction:

SDK_LOG_LEVEL	Extra Logs	Breakdown
debug	15 logs	6 (transaction execution) + 9 (receipt retrieval)
trace	21 logs	8 (transaction execution) + 13 (receipt retrieval)

Related issue(s)

Fixes #4576

Testing Guide

1. Set the SDK_LOG_LEVEL environment variable to different levels (trace, debug, info, warn, error)
2. Start the relay service and observe that SDK logs appear at the configured level
3. Verify that SDK logs are tagged with "name": "sdk-client" for easy identification
4. Confirm that global application logs continue to use the LOG_LEVEL setting independently
5. Run the test suite: SDK Logger Configuration to verify all test cases pass

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  269 suites  ±0   22m 40s ⏱️ +43s
778 tests ±0  774 ✅ +1  4 💤 ±0  0 ❌  - 1 
794 runs  ±0  790 ✅ +1  4 💤 ±0  0 ❌  - 1 

Results for commit a352dd5. ± Comparison against base commit db87e7f.

♻️ This comment has been updated with latest results.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

@@           Coverage Diff           @@
##             main    #4578   +/-   ##
=======================================
  Coverage   95.41%   95.42%           
=======================================
  Files         128      128           
  Lines       20668    20680   +12     
  Branches     1760     1762    +2     
=======================================
+ Hits        19721    19733   +12     
  Misses        928      928           
  Partials       19       19           

Flag	Coverage Δ
config-service	98.82% <100.00%> (+<0.01%)	⬆️
relay	90.86% <100.00%> (+<0.01%)	⬆️
server	88.93% <ø> (ø)
ws-server	98.04% <ø> (ø)

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

Files with missing lines	Coverage Δ
...ckages/config-service/src/services/globalConfig.ts	100.00% <100.00%> (ø)
packages/relay/src/lib/clients/sdkClient.ts	95.87% <100.00%> (+0.04%)	⬆️

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