Add threadTs to BlockActionPayload.Container

[gavinbunney]

This PR adds threadTs to BlockActionPayload.Container, resolving #1200

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)
• [x] slack-app-backend (The primitive layer of Bolt for Java)

Requirements

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[salesforce-cla[bot]]

Thanks for the contribution! Before we can merge this, we need @gavinbunney to sign the Salesforce Inc. Contributor License Agreement.

[codecov[bot]]

Codecov Report

Merging #1201 (e398eff) into main (fac13fc) will increase coverage by 0.00%. The diff coverage is n/a.

@@            Coverage Diff            @@
##               main    #1201   +/-   ##
=========================================
  Coverage     75.13%   75.14%           
- Complexity     3996     3997    +1     
=========================================
  Files           430      430           
  Lines         12528    12528           
  Branches       1261     1261           
=========================================
+ Hits           9413     9414    +1     
+ Misses         2363     2362    -1     
  Partials        752      752           

see 1 file with indirect coverage changes

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