fix: minor history fixes

[rossiam]

• treat integer values for before and after flags as seconds since the epoch as describe in the help
• refactor: simplified sort function
• refactor: minor reformatting
• refactor: use confirm inquirer input type for y/n question instead of text input
• in JSON/YAML output, strictly obey after
  • the API first returns items after the specified after but allows the user to continue on with the "next" page link
  • the interactive table format output still allows the user to continue on to view items, as the API does
  • when asking for JSON or YAML output, we now strictly obey the after flag

Checklist

• [x] I have read the CONTRIBUTING document
• [x] Any required documentation has been added
• [x] My code follows the code style of this project (npm run lint produces no warnings/errors)
• [x] I have added tests to cover my changes

[changeset-bot[bot]]

🦋 Changeset detected

Latest commit: de1a16003627612c264889e91c0dacca871102b5

The changes in this PR will be included in the next version bump.

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| Name | Type | | ---------------- | ----- | | @smartthings/cli | Patch |

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