[feat] Make Search component more extendable

[gidjin]

Does your feature request relate to a specific USWDS component?
Yes Search

What USWDS Version is this feature present in?
Current

Is your feature request related to a problem? Please describe.
Many of our props take inputProps to pass down to the underlying <TextInput> or <input> tag. Search should also allow for that, as well as other possible unforseen customization.

Describe the solution you'd like
Make it easier to extend or customize the Search/ search related components.

Describe alternatives you've considered

• Option one, add inputProps to Search and pass it down to TextInput.
• Option two, make Search more composable in general
  • create a SearchForm component that encapsulates the search form specific props and use it in the Search component
  • create a SearchButton component that encapsulates the custom button
  • use these in Search and storybook examples
  • We should consider if adding inputProps makes sense here or if just an example of building it out separately is enough.