Add Child Bridge Pin Code

[donavanbecker]

♻️ Current situation

Currently when you click into the Child Bridge settings for pairing it doesn't show a PIN code.

💡 Proposed solution

This will now display the PIN code so that you can just type in the code. The reason this is useful is because you can actually set different PIN codes per Child bridge within the plugin's _bridge config. Example:

            "_bridge": {
                "name": "Homebridge Child Bridge",
                "manufacturer": "Homebridge Child",
                "model": "Bridge",
                "pin": "123-45-678",
                "username": "0A:B1:23:4C:56:7D",
                "port": 54743
            },

⚙️ Release Notes

PIN code is now displayed, under the QR code, when viewing Child Bridge Settings.

➕ Additional Information

If applicable, provide additional context in this section.

Testing

Which tests were added? Which existing tests were adapted/changed? Which situations are covered, and what edge cases are missing?

Reviewer Nudging

Where should the reviewer start? what is a good entry point?