Export MemoryInstallationStore and FileInstallationStore

[misscoded]

Summary

Fixes #941

Exports the MemoryInstallationStore and FileInstallationStore classes from @slack/oauth to allow developers the ability to import and use them directly in their projects as the chosen InstallationStore.

Dependent on oauth@2.2

Requirements (place an x in each [ ])

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

[seratch]

As the failing builds indicate, you need to release a new version of @slack/oauth that provides the store implementations first.

[misscoded]

As the failing builds indicate, you need to release a new version of @slack/oauth that provides the store implementations first.

Yep! I've noted that dependency in the Summary. I'm trying to get everything in order and ready to go.

[codecov]

Codecov Report

Merging #1003 (7265995) into main (260acde) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main    #1003   +/-   ##
=======================================
  Coverage   66.41%   66.41%           
=======================================
  Files          13       13           
  Lines        1212     1212           
  Branches      357      357           
=======================================
  Hits          805      805           
  Misses        338      338           
  Partials       69       69           

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