[bluetooth.generic] Added support for generic bluetooth devices (#8775)

* Generic Bluetooth Binding Initial Contribution

Signed-off-by: Connor Petty <mistercpp2000+gitsignoff@gmail.com>

bundles/org.openhab.binding.bluetooth.generic/README.md

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+# Generic Bluetooth Device
+
+This binding adds support for devices that expose [Bluetooth Generic Attributes (GATT)](https://www.bluetooth.com/specifications/gatt/)
+
+## Supported Things
+
+Only a single thing type is added by this binding:
+
+| Thing Type ID | Description                                     |
+|---------------|-------------------------------------------------|
+| generic       | A generic connectable bluetooth device          |
+
+## Discovery
+
+As any other Bluetooth device, generic bluetooth devices are discovered automatically by the corresponding bridge.
+Generic bluetooth devices will be discovered for any connectable bluetooth device that doesn't match another bluetooth binding.
+
+## Thing Configuration
+
+| Parameter       | Required | Default | Description                                                         |
+|-----------------|----------|---------|---------------------------------------------------------------------|
+| address         | yes      |         | The address of the bluetooth device (in format "XX:XX:XX:XX:XX:XX") |
+| pollingInterval | no       | 30      | The frequency at which readable characteristics will refresh        |
+
+## Channels
+
+Channels will be dynamically created based on types of characteristics the device supports.
+This binding contains a mostly complete database of standardized GATT services and characteristics 
+that is used to map characteristics to one or multiple channels.
+
+Characteristics not in the database will be mapped to a single `String` channel labeled `Unknown`.
+The data visible from unknown channels will be the raw binary data formated as hexadecimal.
+Data written (if the unknown characteristic has write support) to unknown channels must likewise be in hexadecimal.