Added fromStringDer() method (and tests) and deprecated fromString() method

[svetoslav-nikol0v]

Description:

• deprecated fromString() method to prevent future confusion
• regardless of the method being deprecated, a warning message was added that suggests the developer use one of the other methods
• added a new fromStringDer() method that is used for a HEX-encoded string with a DER prefix for developer convenience
• tests for fromStringDer() method

Related issue(s):

Fixes #2027

Checklist

• Documented (Code comments, README, etc.)
• Tested (unit, integration, etc.)

[codecov]

Codecov Report

Attention: 4 lines in your changes are missing coverage. Please review.

Comparison is base (ff951ea) 76.12% compared to head (8aa887e) 83.79%.
Report is 3 commits behind head on develop.

❗ Current head 8aa887e differs from pull request most recent head 9ac9622. Consider uploading reports for the commit 9ac9622 to get more accurate results

Files	Patch %	Lines
src/LocalProvider.js	71.42%	2 Missing ⚠️
src/constants/ClientConstants.js	0.00%	2 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #2030      +/-   ##
===========================================
+ Coverage    76.12%   83.79%   +7.66%     
===========================================
  Files          304      304              
  Lines        75854    75861       +7     
===========================================
+ Hits         57746    63569    +5823     
+ Misses       18108    12292    -5816     

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[sonarcloud]

Kudos, SonarCloud Quality Gate passed!   

0 Bugs
0 Vulnerabilities
0 Security Hotspots
0 Code Smells

No Coverage information
0.0% Duplication