Ability to prevent input from being given focus

[luke-denton-ofx]

Is your feature request related to a problem? Please describe.
On mobile, with the date picker set to render using a portal, when we tap the date field, the date picker modal will appear. However, in the background, the input gains focus, which on mobile means the soft keyboard gets displayed

Describe the solution you'd like
A way to disable the input from being focused while a date picker portal is being displayed, so that the soft keyboard on a mobile device doesn't appear

Describe alternatives you've considered
Creating a custom input. This is probably the route we're going to have to go in the meantime, but that just means a fair bit more overhead to work around a limitation we believe is in the library

Additional context

Can test with: https://reactdatepicker.com/#example-portal-by-id.
Notice that clicking the input will display the datepicker modal, but it will also show up the soft keyboard