Replaces `WorkflowLauncher` and `thenProceed(with:)` with a new `WorkflowView` API, as discussed in #61

[Tyler-Keith-Thompson]

Linked Issue: Closes #156

Checklist:

• [x] Did you sign the Contributor License Agreement?
• [x] Is the linter reporting 0 errors?
• [x] Did you comply with our styleguide?
• [x] Is there adequate test coverage for your new code?
• [x] Does the CI pipeline pass?
• [x] Did you update the documentation?
• [x] Did you update the sample app?
• [x] Do we need to increment the minor/major version?
• [x] Did you change the public API?
• [x] Have you done everything you can to make sure that errors that can occur are compile-time errors, and if they have to be runtime do you have adequate tests and documentation around those runtime errors? For more details.

---

If Applicable:

• [x] Did you test when the first item is skipped?
• [x] Did you test when the last item is skipped?
• [x] Did you test when middle items are skipped?
• [x] Did you test when incorrect data is passed forward?
• [x] Did you test proceeding backwards?

---

If Public API Has Changed:

• [x] Did you deprecate (rather than remove) any old methods/variables/etc? Our philosophy for deprecation.
• [x] Have you done the best that you can to make sure that the compiler guides people to changing to the new API? (Example: the renamed attribute)
• [x] If necessary, have you tested the upgrade path for at least N-1 versions? For example, if data persists between v1 and v2 then that upgrade should be tested and as easy as we can make it.

[codecov-commenter]

Codecov Report

Merging #179 (94f06fe) into main (f69e8ac) will decrease coverage by 0.30%. The diff coverage is 87.76%.

@@            Coverage Diff             @@
##             main     #179      +/-   ##
==========================================
- Coverage   91.28%   90.97%   -0.31%     
==========================================
  Files          92      102      +10     
  Lines        2375     2538     +163     
==========================================
+ Hits         2168     2309     +141     
- Misses        207      229      +22     

Impacted Files	Coverage Δ
...xample/Views/Settings/SettingsViewController.swift	0.00% <0.00%> (ø)
...UI/Deprecations/WorkflowLauncherDeprecations.swift	0.00% <0.00%> (ø)
...rent_SwiftUI/ViewModifiers/NavigationWrapper.swift	100.00% <ø> (ø)
...rent_SwiftUI/Protocols/_WorkflowItemProtocol.swift	25.00% <25.00%> (ø)
...Example/Views/Profile/AccountInformationView.swift	79.71% <41.17%> (ø)
...ftUIExample/SwiftUIExample/SwiftUIExampleApp.swift	92.30% <80.00%> (ø)
...ws/Settings/SettingsOnboardingViewController.swift	88.23% <88.23%> (ø)
ExampleApps/SwiftUIExample/Views/ContentView.swift	93.75% <100.00%> (+1.44%)	:arrow_up:
ExampleApps/SwiftUIExample/Views/LoginView.swift	94.33% <100.00%> (ø)
...rrent_SwiftUI/ResultBuilders/WorkflowBuilder.swift	100.00% <100.00%> (ø)
... and 8 more

---

Continue to review full report at Codecov.

Legend - Click here to learn more Δ = absolute <relative> (impact), ø = not affected, ? = missing data Powered by Codecov. Last update 5ad629b...94f06fe. Read the comment docs.

[morganzellers]

I'm liking this a lot. I think the main thing said against a style similar to this when originally discussing the SwiftUI API was that it didn't feel clear enough that this is an ordered sequence of FR's. I'm not really feeling that so much anymore with this. Having sat with the choice we made about the SwiftUI API, I don't think it was as crucial as we made it out to be.

[Tyler-Keith-Thompson]

We did change the public API but I don't know if there's a great way to have the compiler guide people to the new change. This is something the team should discuss before merging.

The changes to WorkflowItem and the lowering of the ACL on WorkflowLauncher are what lead me to think it won't be reasonable to guide people to WorkflowView.