Add Solana SDK Test (Base58) library

[priyanshpatel18]

This PR adds the Solana SDK (Base58) library to the Arduino Library Registry.

• Library Name: Solana SDK Test
• Version: v1.0.0
• Description: Base58 encoding/decoding utilities for Solana development on Arduino/PlatformIO.
• Category: Data Processing

This is the first step toward a modular Solana SDK for microcontrollers, starting with Base58 support

[github-actions]

Hi @priyanshpatel18
A problem was found with your pull request:

❌ ERROR: Pull request removes newline from the end of a file.
Please add a blank line to the end of the file.

Please resolve this error. The checks will automatically run again once that is done.

More information:
https://github.com/arduino/library-registry/blob/main/README.md#if-the-problem-is-with-the-pull-request

[github-actions]

❌ ERROR: Arduino Lint found errors with https://github.com/priyanshpatel18/solana-sdk-test:

Linting library in solana-sdk-test
ERROR: Path does not contain a valid Arduino library.                         
       See: https://arduino.github.io/arduino-cli/latest/library-specification
       (Rule LS001)                                                           
INFO: No header file found matching library name (Solana_Base58.h). Best practices are for primary header filename to   
      match library name.                                                                                               
      See: https://arduino.github.io/arduino-cli/latest/library-specification/#libraryproperties-file-format            
      (Rule LS008)                                                                                                      
WARNING: library.properties name Solana Base58 contains spaces. Although supported, best practices is to not use spaces.
         See: https://arduino.github.io/arduino-cli/latest/library-specification/#libraryproperties-file-format         
         (Rule LP015)                                                                                                   
WARNING: No example sketches found. Please provide examples.                                      
         See: https://arduino.github.io/arduino-cli/latest/library-specification/#library-examples
         (Rule LD004)                                                                             

Linter results for project: 1 ERRORS, 2 WARNINGS

-------------------

[github-actions]

Thanks for your interest in contributing to the Arduino Library Manager index @priyanshpatel18
Please resolve the error(s) mentioned in the previous comment.

After resolving the issue, trigger this check again by doing one of the following:

• Commit the required change to the branch you submitted this pull request from.
• Comment here, mentioning @ArduinoBot in the comment.

❗ NOTE: It is not necessary to open a new pull request. ❗

More information:
https://github.com/arduino/library-registry/blob/main/README.md#if-the-problem-is-with-the-pull-request