jwt flow

[k-capehart]

• [feature]: add auth jwt
• update README
• [fix] auth_test consumerRSAPem
• Update salesforce.go
• fix jwt exp
• small adjustments

Authenticate to Salesforce using the JWT Bearer flow.
Docs:

• https://help.salesforce.com/s/articleView?id=sf.remoteaccess_oauth_jwt_flow.htm&type=5
• https://developer.salesforce.com/docs/atlas.en-us.sfdx_dev.meta/sfdx_dev/sfdx_dev_auth_jwt_flow.htm
• https://developer.salesforce.com/docs/atlas.en-us.sfdx_dev.meta/sfdx_dev/sfdx_dev_auth_key_and_cert.htm

[codecov]

Codecov Report

Attention: Patch coverage is 83.92857% with 9 lines in your changes missing coverage. Please review.

Project coverage is 85.47%. Comparing base (3496b09) to head (5bdcded).
Report is 10 commits behind head on main.

Files with missing lines	Patch %	Lines
auth.go	78.57%	5 Missing and 4 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #68      +/-   ##
==========================================
- Coverage   87.84%   85.47%   -2.38%     
==========================================
  Files           6        6              
  Lines        1111     1404     +293     
==========================================
+ Hits          976     1200     +224     
- Misses         69      134      +65     
- Partials       66       70       +4     

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[k-capehart]

@TuSKan FYI