feat: add a GitHub Action to check spelling

[jbampton]

• I already fixed the spelling with this tool
• Run only on pull request
• Using https://github.com/client9/misspell

Description

misspell is a Golang tool to check spelling and pass in -w for autocorrect

My changes affect the following components

• [ ] API
• [ ] Controller
• [ ] Message Bus (e.g., Kafka)
• [ ] Loadbalancer
• [ ] Scheduler
• [ ] Invoker
• [ ] Intrinsic actions (e.g., sequences, conductors)
• [ ] Data stores (e.g., CouchDB)
• [X] Tests
• [ ] Deployment
• [ ] CLI
• [ ] General tooling
• [ ] Documentation

Types of changes

• [ ] Bug fix (generally a non-breaking change which closes an issue).
• [X] Enhancement or new feature (adds new functionality).
• [ ] Breaking change (a bug fix or enhancement which changes existing behavior).

Checklist:

• [ ] I signed an Apache CLA.
• [ ] I reviewed the style guides and followed the recommendations (Travis CI will check :).
• [ ] I added tests to cover my changes.
• [X] My changes require further changes to the documentation.
• [ ] I updated the documentation where necessary.

[codecov-io]

Codecov Report

Merging #5089 (e89fe60) into master (659b762) will decrease coverage by 7.32%. The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #5089      +/-   ##
==========================================
- Coverage   81.92%   74.59%   -7.33%     
==========================================
  Files         213      206       -7     
  Lines       10316    10051     -265     
  Branches      452      449       -3     
==========================================
- Hits         8451     7498     -953     
- Misses       1865     2553     +688     

Impacted Files	Coverage Δ
...core/database/cosmosdb/RxObservableImplicits.scala	0.00% <0.00%> (-100.00%)	:arrow_down:
...ore/database/cosmosdb/cache/CacheInvalidator.scala	0.00% <0.00%> (-100.00%)	:arrow_down:
...e/database/cosmosdb/cache/ChangeFeedConsumer.scala	0.00% <0.00%> (-100.00%)	:arrow_down:
...core/database/cosmosdb/CosmosDBArtifactStore.scala	0.00% <0.00%> (-95.48%)	:arrow_down:
...sk/core/database/cosmosdb/CosmosDBViewMapper.scala	0.00% <0.00%> (-93.90%)	:arrow_down:
...tabase/cosmosdb/cache/CacheInvalidatorConfig.scala	0.00% <0.00%> (-92.31%)	:arrow_down:
...enwhisk/connector/kafka/KamonMetricsReporter.scala	0.00% <0.00%> (-83.34%)	:arrow_down:
...e/database/cosmosdb/cache/KafkaEventProducer.scala	0.00% <0.00%> (-78.58%)	:arrow_down:
...whisk/core/database/cosmosdb/CosmosDBSupport.scala	0.00% <0.00%> (-74.08%)	:arrow_down:
...ore/database/azblob/AzureBlobAttachmentStore.scala	11.53% <0.00%> (-60.58%)	:arrow_down:
... and 32 more

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