Add support for Asctime date format

[MattFromGer]

Description

Add support for ANSI C Asctime date format

Motivation and Context

Testing

I included tests for formatting & parsing

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)

Checklist

• I have read the CONTRIBUTING document
• Local run of mvn install succeeds
• My code follows the code style of this project
• My change requires a change to the Javadoc documentation
• I have updated the Javadoc documentation accordingly
• I have read the README document
• I have added tests to cover my changes
• All new and existing tests passed
• A short description of the change has been added to the CHANGELOG
• My change is to implement 1.11 parity feature and I have updated LaunchChangelog

License

• I confirm that this pull request can be released under the Apache 2 license

[dagnir]

Hi @MattFromGer I'm going through the PR backlog. What is the motivation for this feature?

[MattFromGer]

Hey @dagnir, the Amazon Gift Card Incentives API is using this format. I've set up a client using the SDK here. With this PR dates could be automatically parsed.
Maybe out of scope for you guys, and more of a "nice to have" sort of thing.

[dagnir]

Ah okay thanks for the context 😄 The change itself looks fine but yes, this falls in more in the nice to have category for now since no included services use this format.

If a service starts using this type in the future, we'll need to make sure the other SDKs behave the same way w.r.t to this type. I'm going to go ahead and close this in the mean time, but it can be revived once we have a need to add support for it!

PS. I think it's really awesome to see you're using the SDK code generator to generate a custom SDK!