fix(input): label position and overflow is correct

[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?

Two issues:

1. Using certain fill settings on ion-input led to dead space. This was happening because padding was being added to .input-wrapper. When clicking that padding, you were clicking neither the label nor the input which meant that the input was never focused.
2. Text was not overflowing when using a fixed label.

What is the new behavior?

• The .input-wrapper element is now the label ensuring that there is never any dead space (This is valid usage: https://developer.mozilla.org/en-US/docs/Web/HTML/Element/label). This also removes the need to explicitly add htmlFor on <label>.
• Added CSS and changed the structure of the label text to ensure that text in the fixed label overflows correctly.

Does this introduce a breaking change?

• Yes
• No

Other information

[liamdebeasi]

Moving this back to a draft. Found a bug - will reopen soon

The bug is not due to the changes in this PR, so I will make open a separate PR.