Standardize/abstract form control labels and common Inputs

Most form controls share a general structure, with a `ibm-form-item` component we can standardize our label handling and reduce repitetion. We should also implement a `BaseFormControl` that provides common `Input`s, `Output`s, and methods (such as `isTemplate`)

`ibm-form-item` rough sample (for `ibm-select`):

```html

```

Start by comparing the existing form-control components and the proposed ibm-form-item sample. Identify the shared label handling, Inputs, Outputs, and methods such as isTemplate that can move into BaseFormControl. Done means common behavior is standardized across the relevant controls without repeating their shared structure.

Written by the indexing model from the issue text.