[HERMES-5354] Add `userScopes` to `ISlackManifestShared`

[srajiang]

Summary

Adds the userScopes property to the ISlackManifestShared interface. Ask from BE folks to enable authoring app manifest that use built-ins with user-delegated auth.

Context thread

Changes:

• Moves userScopes property to the ISlackManifestShared interface and sets the value on Manifest if not empty
• Normally Run on Slack apps have token_management_enabled defaulted to false on behalf of the developer. But in the case where user scopes are requested, the backend requires token_management_enabled to be set to true. So I have modified the SDK behavior to default to setting the value to true only when there's at least one user scope defined.

Requirements (place an x in each [ ])

• [x] I've read and understood the Contributing Guidelines and have done my best effort to follow them.
• [x] I've read and agree to the Code of Conduct.

[codecov[bot]]

Codecov Report

Merging #189 (8eda211) into main (abd4e33) will not change coverage. The diff coverage is 100.00%.

@@           Coverage Diff           @@
##             main     #189   +/-   ##
=======================================
  Coverage   99.23%   99.23%           
=======================================
  Files          55       55           
  Lines        2084     2084           
  Branches      115      115           
=======================================
  Hits         2068     2068           
  Misses         15       15           
  Partials        1        1           

Impacted Files	Coverage Δ
src/manifest/mod.ts	100.00% <100.00%> (ø)

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