Add missing public init to StackOrchestrator.FetchResource

[filipe-lemos]

Checklist

• I've rebased my changes on top of master
• I've built and run the project to see all new and existing tests pass
• I've followed the Mindera swift style guide
• I've read the Contribution Guidelines
• I've updated the documentation if necessary.

Motivation and Context

StackOrchestrator.FetchResource is missing its public init only having the synthesized internal init.

Description

StackOrchestrator.FetchResource needs to be inited as it's the typealias for StackOrchestratorStore.Resource and necessary as a parameter on StackOrchestratorStore.fetch(resource:completion:). No helpers or alternative methods seem to be available for instantiating the struct so the absence of the explicit init is most likely an oversight.

[codecov]

Codecov Report

Merging #225 (40b4192) into master (7701fb5) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master     #225   +/-   ##
=======================================
  Coverage   94.97%   94.98%           
=======================================
  Files          97       97           
  Lines        3263     3267    +4     
=======================================
+ Hits         3099     3103    +4     
  Misses        164      164           

Impacted Files	Coverage Δ
Sources/StackOrchestrator/StackOrchestrator.swift	100.00% <100.00%> (ø)

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[p4checo]

Thanks for this! Days since I forgot a public init: 0 😅