stdlib: update the keymap configuration interface

[frazze-jobb]

Changes the interface for updating the keymap configuration in the shell so that it is configurable via kernel app config parameter.

[github-actions]

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[garazdawi]

Since we are exposing the edlin module I think we should add a function to it to fetch the current keymap.

Also the keymap configuration parameter should be in the stdlib application as there is where most of the parameters for the shell are located.

The keymap key should also be listed in Stdlib and should probably be called "shell_keymap" for consistency.

I assume the tty documentation also needs some updates?

And also shell should probably mention that it is possible to configure the keymap?

[garazdawi]

You need to add an entry in edlin.xml for the new function, but besides that this looks good to me.