Fixes #298

This PR adds support for configuring colors for pods and containers.

podColors="38;2;255;97;136,38;2;169;220;118,38;2;255;216;102,38;2;120;220;232,38;2;171;157;242"
dist/stern --pod-colors "$podColors" --tail 1 --only-log-lines deployment/app

Customize highlight colors

You can configure highlight colors for pods and containers in the config file using a comma-separated list of SGR (Select Graphic Rendition) sequences, as shown below. If you omit container-colors, the pod colors will be used as container colors as well.

# Green, Yellow, Blue, Magenta, Cyan, White
pod-colors: "32,33,34,35,36,37"

# Colors with underline (4)
# If empty, the pod colors will be used as container colors
container-colors: "32;4,33;4,34;4,35;4,36;4,37;4"

This format enables the use of various attributes, such as underline, background colors, 8-bit colors, and 24-bit colors, if your terminal supports them.

The equivalent flags --pod-colors and --container-colors are also available. The following command applies 24-bit colors using the --pod-colors flag.

# Monokai theme
podColors="38;2;255;97;136,38;2;169;220;118,38;2;255;216;102,38;2;120;220;232,38;2;171;157;242"
stern --pod-colors "$podColors" deploy/app