Setting to set pane highlight active, inactive and broadcast color

[Techypanda]

Summary of the Pull Request

This commit adds a new setting in which you can configure the active highlight color of panes as well as inactive and broadcast. This will only happen if configured otherwise uses the default as suggested by #3061

References and Relevant Issues

#3061

Detailed Description of the Pull Request / Additional comments

When modifying the settings you can now set pane key to have the following properties:

• "activeBorderColor"
• "inactiveBorderColor"
• "broadcastBorderColor"
  This allows for more configuration of the windows terminal

Validation Steps Performed

Built Locally, Ran Locally and configured a profile with the following theme:

"themes": 
[
    {
        "name": "Under Construction",
        "tab": {
            "background": "#FFFF00FF",
            "iconStyle": "default",
            "showCloseButton": "always",
            "unfocusedBackground": "#88440088"
        },
        "tabRow": {
            "background": "#FF8800FF",
            "unfocusedBackground": "#202020FF"
        },
        "window": {
            "applicationTheme": "light",
            "experimental.rainbowFrame": false,
            "frame": null,
            "unfocusedFrame": null,
            "useMica": true
        },
        "pane": {
            "activeBorderColor": "#13A10E",
            "inactiveBorderColor": "#61D6D6"
        }
    }
]

PR Checklist

• Closes Add a setting to manually set the Pane highlight color #3061
• Tests added/passed (None added, can't see how to unit test this but happy to add/dive deeper)
• Documentation updated
  • If checked, please file a pull request on our docs repo and link it here: #xxx
• Schema updated (if necessary) -> I have modified to the best of my knowledge

[Techypanda]

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