Fix #1019 Add video block to Block Kit support

[seratch]

This pull request resolves #1019

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 are agreeing to the those rules.

[codecov]

Codecov Report

Merging #1020 (d477b05) into main (ff84898) will decrease coverage by 0.03%.
The diff coverage is 68.57%.

@@             Coverage Diff              @@
##               main    #1020      +/-   ##
============================================
- Coverage     76.70%   76.66%   -0.04%     
- Complexity     3689     3697       +8     
============================================
  Files           403      406       +3     
  Lines         11121    11156      +35     
  Branches       1111     1111              
============================================
+ Hits           8530     8553      +23     
- Misses         1921     1932      +11     
- Partials        670      671       +1     

Impacted Files	Coverage Δ
...model/kotlin_extension/block/dsl/LayoutBlockDsl.kt	33.33% <ø> (ø)
...rc/main/java/com/slack/api/model/block/Blocks.java	94.44% <0.00%> (-5.56%)	⬇️
...ension/block/composition/dsl/PlainTextObjectDsl.kt	33.33% <33.33%> (ø)
.../model/kotlin_extension/block/VideoBlockBuilder.kt	69.23% <69.23%> (ø)
...sition/container/SinglePlainTextObjectContainer.kt	100.00% <100.00%> (ø)
...nsion/block/container/MultiLayoutBlockContainer.kt	95.00% <100.00%> (+0.26%)	⬆️
...om/slack/api/util/json/GsonLayoutBlockFactory.java	80.76% <100.00%> (+0.76%)	⬆️
...imits/metrics/impl/BaseMemoryMetricsDatastore.java	79.65% <0.00%> (-0.44%)	⬇️
...va/com/slack/api/socket_mode/SocketModeClient.java	64.33% <0.00%> (ø)

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update ff84898...d477b05. Read the comment docs.

[WilliamBergamin]

LGTM