Add the ability to customize Session Status color

Summary of the new feature

Currently the colors of session statuses are almost invisible when you are using a light color theme

        let statusIconText = "$(terminal) ";
        let statusColor = "#affc74";

        if (status === SessionStatus.Initializing) {
            statusIconText = "$(sync) ";
            statusColor = "#f3fc74";
        } else if (status === SessionStatus.Failed) {
            statusIconText = "$(alert) ";
            statusColor = "#fcc174";
        }

[SydneyhSmith]

@ihodev thanks for opening this issue--would you mind attaching a screen shot of the session status so we can better understand the problem--Thanks!

[rjmholt]

@TylerLeonhardt may have more experience in this area

would you mind attaching a screen shot of the session status

Yes, of course. Here it is

[SydneyhSmith]

Thanks @ihodev that is very difficult to read!

[SydneyhSmith]

@ihodev if we made this an easier color to read rather than make it customizable would that be satisfactory?

@SydneyhSmith I think if colors will have approximately the same lightness as a default status bar foreground color that will be ok.