device_iot_config: store iot device info

Store remote basic info (e.g. name, dev class, dev type, etc.)
and profile info (a2dp/hfp/avrcp/gap) to local conf file.

Snapshot as of:
43ab2ffdf6bdc48d0fb4a4d715da8863599f24e0
e080af8694d274d5db20204c48b9f6b714b17498
48b1654da46649a01ee9ab422f20aa60b8b31efd
964e674a41dbfdea612c66c684abc4d0e27500c1

Sponsor: narajn@
Bug: 261319328
Tag: #feature
Test: atest bluetooth_test_gd
BYPASS_LONG_LINES_REASON: Bluetooth likes 120 lines

Change-Id: If4c2632d3874fbec1e3477f40cd11b4b1db7a118