community/obexd: separate from main/bluez and enable PBAP support

BlueZ can share the phonebook with car multimedia devices but this feature must be configured at build time.

OBEXD has now PBAP capabilities to share an Evolution's addressbook with Bluetooth clients such as a car multimedia system. However, it requires evolution-data-server-dev dependencies which cannot be moved into main.

This package provides the same OBEXD as in the main BlueZ package but with enhanced capabilities such as PBAP support. Users can opt-in for this package which replaces OBEXD provided by the bluez-obexd package.

Demo 1: https://tube.tchncs.de/w/us9acnm8TM9ERSjn9uTt51

Demo 2 with PyOBEX pbapclient.py:

dylan@dell-laptop pyobex]$ ./examples/pbapclient.py $BLUETOOTH_ADDRESS

Available cards in telecom/pb

0.vcf: User;Linux
1.vcf: User;Linux
2.vcf: postmarketOS
3.vcf: Van Assche;Dylan

Cards in telecom/pb

b'BEGIN:VCARD\r\nVERSION:2.1\r\nUID:pas-id-a8086efa18cab45c6fea7ab29fe444c10ce9fc8b\r\nFN:Linux User\r\nN:User;Linux;;;\r\nREV:2022-01-30T19:43:08Z\r\nEND:VCARD'
b'BEGIN:VCARD\r\nVERSION:2.1\r\nUID:pas-id-a8086efa18cab45c6fea7ab29fe444c10ce9fc8b\r\nFN:Linux User\r\nN:User;Linux;;;\r\nREV:2022-01-30T19:43:08Z\r\nEND:VCARD'
b'BEGIN:VCARD\r\nVERSION:2.1\r\nUID:pas-id-b52ed78d75cfc32bf9f963bae8a9e4be4d7763eb\r\nTEL;TYPE=CELL:+65862256621\r\nFN:postmarketOS\r\nN:;postmarketOS;;;\r\nREV:2022-01-30T19:35:11Z\r\nEND:VCARD'
b'BEGIN:VCARD\r\nVERSION:2.1\r\nUID:pas-id-c63eeeb25ea988bc86fe83cdfa58a449b47ad18f\r\nTEL;TYPE=CELL:+3136647862\r\nFN:Dylan Van Assche\r\nN:Van Assche;Dylan;;;\r\nREV:2022-01-30T19:34:42Z\r\nEND:VCARD'