✨ Added the workflow scheme service.

[ctreminiom]

1. Added the ability to CRUD the worflow schemes on the V2
2. Added the ability to assign workflow scheme to a project (v3,v2)
3. Added the ability to get the project/workflow scheme associations (v3,v2)

[codecov]

Codecov Report

Merging #79 (1fbbb91) into main (3268c52) will not change coverage.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##              main       #79    +/-   ##
==========================================
  Coverage   100.00%   100.00%            
==========================================
  Files          140       141     +1     
  Lines        10317     10460   +143     
==========================================
+ Hits         10317     10460   +143     

Impacted Files	Coverage Δ
jira/v2/workflow.go	100.00% <ø> (ø)
jira/v2/jira.go	100.00% <100.00%> (ø)
jira/v2/workflowScheme.go	100.00% <100.00%> (ø)
jira/v3/workflowScheme.go	100.00% <100.00%> (ø)

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