Export Feature Flag Inventory so it can be accessed more quickly

[CDRussell]

Task/Issue URL: https://app.asana.com/0/608920331025315/1209308971637996

Description

In internal builds, we have Feature Flag Inventory available for toggling features flags from the UI inside our app.

It can only be launched from the settings UI:

• (exit whatever screen you might have been in)
• Overflow
• Settings
• Scroll
• Feature Flag Inventory

Objective

• Mark the activity as exported
• This would allow it to be launched directly. e.g., an alias from the command line.
• As well as being easier to trigger as a developer, it would also have the advantage that you can quickly get to the screen without losing your current place in the app.

Steps to test this PR

QA optional

[CDRussell]

• Export Feature Flag Inventory so it can be accessed more quickly #5584 👈 (View in Graphite)
• develop

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