Add L5 "ignore health bit" command

[dgramop]

While not formally part of the F9P interface description, UBLOX modules with L5 support come with L5 "ignored" by default, since it ignores satellites with the health bit set to unhealthy.

See: https://content.u-blox.com/sites/default/files/documents/GPS-L5-configuration_AppNote_UBX-21038688.pdf

The solution is to send a configuration command, which they present as a byte string. In effect, this is just a configuration command. I added it as a value in the CfgVal enum.

[gwbres]

Hello @dgramop, thank you for the proposal.

while this seems benign, I think it would really benefit being optional. This it is not compatible with a critical applications using F9P series, and I have no idea how it might interfere with -10 series, for the day we inquire usage of the latest serie

[dgramop]

By what mechanism would you suggest I make this optional?

Features, generics... etc?

Whatever fits your vision for the project best :)