Handle EFI_IFR_TEXT

[crawfxrd]

EFI_IFR_TEXT is used for static text and images. It can be used to display a prompt with a value.

It could also be selectable (highlight) but not editable to display the help string for additional context, although this is probably non-standard. (A Thinkpad does not allow selecting them, for example.)

An example of it in the default edk2 DisplayEngineDxe:

This could replace the use of subtitle in the firmware config info form in edk2, and allow values to be aligned.

Ref: UEFI Spec 2.10, 33.3.8.3.76 EFI_IFR_TEXT
Ref: https://gitlab.redox-os.org/redox-os/uefi/-/merge_requests/15