feat(picker-column): assign custom aria-labels to column options

[sean-perkins]

Pull request checklist

Please check if your PR fulfills the following requirements:

• Tests for the changes have been added (for bug fixes / features)
• Docs have been reviewed and added / updated if needed (for bug fixes / features)
  • Some docs updates need to be made in the ionic-docs repo, in a separate PR. See the contributing guide for details.
• Build (npm run build) was run locally and any changes were pushed
• Lint (npm run lint) has passed locally and any fixes were made for failures

Pull request type

Please check the type of change your PR introduces:

• Bugfix
• Feature
• Code style update (formatting, renaming)
• Refactoring (no functional changes, no api changes)
• Build related changes
• Documentation content changes
• Other (please describe):

What is the current behavior?

Developers cannot assign an aria-label to the individual button items in a picker column.

Issue URL:

What is the new behavior?

• Developers can optionally assign an ariaLabel to a picker column option, to assign the aria-label to the rendered button.

Does this introduce a breaking change?

• Yes
• No

Other information

Note: Stencil has something strange happening with the spec tests. Since the picker column uses timeouts, you will receive an exception if the tests are located in the same file. The issue doesn't occur if you place the spec tests in separate files. I experimented with Jest timer mocks and this appears to be a Stencil issue. The team has asked I create a minimal reproduction for them to dig into, which will require additional time and isn't a blocker for this feature.

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[liamdebeasi]

One small change, but otherwise this looks great.