Add share_shortcut block support

[seratch]

This pull request adds a new block that can be posted by the next-generation platform's link triggers. Although the next-gen features are still in beta, developers may need to parse those blocks in conversations.history/Discovery API response data and so on if they exist.

We need to add the same in other SDKs.

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

Please read the Contributing guidelines and Code of Conduct before creating this issue or pull request. By submitting, you agree to those rules.

[codecov]

Codecov Report

Merging #1047 (54ae5e6) into main (037bceb) will increase coverage by 0.00%.
The diff coverage is 50.00%.

@@            Coverage Diff            @@
##               main    #1047   +/-   ##
=========================================
  Coverage     76.78%   76.78%           
- Complexity     3705     3707    +2     
=========================================
  Files           406      406           
  Lines         11161    11163    +2     
  Branches       1112     1112           
=========================================
+ Hits           8570     8572    +2     
  Misses         1921     1921           
  Partials        670      670           

Impacted Files	Coverage Δ
...rc/main/java/com/slack/api/model/block/Blocks.java	89.47% <0.00%> (-4.98%)	⬇️
...om/slack/api/util/json/GsonLayoutBlockFactory.java	81.48% <100.00%> (+0.71%)	⬆️
...va/com/slack/api/socket_mode/SocketModeClient.java	64.33% <0.00%> (+0.63%)	⬆️

📣 We’re building smart automated test selection to slash your CI/CD build times. Learn more

[WilliamBergamin]

This looks good to me 💯 where the samples generated?

[seratch]

@WilliamBergamin Good question. Those JSON data are automatically updated when running all the unit and e2e tests.