Add conversations.externalInvitePermissions.set API support

[seratch]

This pull request adds a new endpoint to this SDK:
https://api.slack.com/methods/conversations.externalInvitePermissions.set

Category (place an x in each of the [ ])

• bolt (Bolt for Java)
• bolt-{sub modules} (Bolt for Java - optional modules)
• slack-api-client (Slack API Clients)
• slack-api-model (Slack API Data Models)
• slack-api-*-kotlin-extension (Kotlin Extensions for Slack API Clients)
• slack-app-backend (The primitive layer of Bolt for Java)

Requirements

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[seratch]

@filmaj The JSON data output will be necessary for Node SDK work. If you don't see any issues with the changes here, please feel free to merge this PR into main branch tomorrow

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 74.93%. Comparing base (1b6030e) to head (31e4863).

Additional details and impacted files

@@             Coverage Diff              @@
##               main    #1330      +/-   ##
============================================
+ Coverage     74.91%   74.93%   +0.01%     
- Complexity     4171     4176       +5     
============================================
  Files           446      446              
  Lines         12902    12912      +10     
  Branches       1331     1331              
============================================
+ Hits           9665     9675      +10     
  Misses         2461     2461              
  Partials        776      776              

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[filmaj]

Thanks so much for this! I was actually looking at past PRs in this past project yesterday to figure out: what is the correct process to add a new API to the Java SDK, and thus to also get a response payload into the project for use in generation scripts in the node SDK?

Did you generate the sample JSON in this PR manually?

The reason I ask is that there are several more APIs that we will need to add in the near future, so I'd like to know how it is done. Recently I would send PRs containing only the sample JSON, but with more coming, I would like to know the process you use to approach this problem. In the mean time, I will work backwards from this PR as a guide.

[seratch]

The e2e tests in this repo automatically detect missing properties plus generate JSON files for you.

You need to set up necessary env variables to run the tests but no need to perfectly set up all the things. When you add a new test with sufficient tokens, running the test generates the sample files based on the latest responses from Slack API server.

[filmaj]

Awesome! Thank you for confirming 🙇