feat(picker): add ability to use picker inline

[liamdebeasi]

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?

Issue URL: N/A
Picker can only be presented through pickerController.

What is the new behavior?

• Picker can now be used as an inline component, with support for both isOpen and trigger.
• Also fixes an issue unique to inline pickers where the selected item did not receive the selected class when the picker is re-opened.

Does this introduce a breaking change?

• Yes
• No

Other information

[sean-perkins]

Looks good besides a few copy & paste comments. Will need to rebuild once those changes are in.

[liamdebeasi]

Need to merge #26333 first so I can add tests for inline picker

[sean-perkins]

Nice work!