Get file contents

[b-l-u-e]

Description:
This PR adds a get-file-contents example to demonstrate how to retrieve file contents using the Hedera JavaScript SDK. This functionality is important for developers who need to access and work with file data stored on the Hedera network.

• Added get-file-contents.js example file
• Implemented file contents query using FileContentsQuery
• Included error handling and logging for better developer experience
• Demonstrated proper use of ECDSA keys or ED25519 keys with the SDK

Related issue(s):

• Fixes Create an Example for "Get file contents" functionality #2513

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 84.45%. Comparing base (734aa62) to head (d6514fb).
Report is 15 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2578      +/-   ##
==========================================
+ Coverage   84.43%   84.45%   +0.02%     
==========================================
  Files         283      283              
  Lines       71038    71088      +50     
==========================================
+ Hits        59981    60039      +58     
+ Misses      11057    11049       -8     

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[ivaylogarnev-limechain]

Thank you for your efforts! With those comments addressed the exampled would have finished look.

[sonarcloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarCloud

[ivaylogarnev-limechain]

LGTM! Thanks for your efforts!

[b-l-u-e]

@agadzhalov @rwalworth

[agadzhalov]

LGTM, thank you @b-l-u-e

[b-l-u-e]

@rwalworth please approve