Support to 'as' as prop in NavDropdown

[urielgarciarivas]

What does this PR do?
Supports as as prop in NavDropdown.

Description of tasks completed

• Added support to prop as: PropTypes.elementType to NavDropdown component.
• Created a test for this feature.

What is the related issue?
#5552

[urielgarciarivas]

@kyletsang Should I include tests that checks every single as prop?

[kyletsang]

@kyletsang Should I include tests that checks every single as prop?

A single as test would be good here

[kyletsang]

Thanks looks good to me. @jquense, double checking this with you :)

[jquense]

seems ok...this works because NavItem has no logic in it right? it's purely presentational? Maybe we should make a little note about that

[kyletsang]

Yeah NavItem is purely presentational. Could probably shrink that to createWithBsPrefix another day.

[urielgarciarivas]

So, should I comment line 83 with something like /* The following works because it's purely presentational. to-do: shrink to createWithBsPrefix */ ?

[kyletsang]

So, should I comment line 83 with something like /* The following works because it's purely presentational. to-do: shrink to createWithBsPrefix */ ?

Maybe something like NavItem has no additional logic. Can set nav item class here to support "as"?

You can leave a TODO note in NavItem if you want. I was thinking of reducing some code in v5 branch later on.

[kyletsang]

Thanks!