monitor/att: Add support for decoding Characteristic Declaration

monitor/att: Add support for decoding Characteristic Declaration

This adds supports for decoding the so called Characteristic
Declaration (0x2803):

> ACL Data RX: Handle 3585 flags 0x02 dlen 76
      ATT: Read By Type Response (0x09) len 71
        Attribute data length: 7
        Attribute data list: 10 entries
        Handle: 0x0002
        Value: 200300052a
            Properties: 0x20
              Indicate (0x20)
            Value Handle: 0x0003
            Value UUID: Service Changed (0x2a05)
        Handle: 0x0015
        Value: 021600002a
            Properties: 0x02
              Read (0x02)
            Value Handle: 0x0016
            Value UUID: Device Name (0x2a00)
        Handle: 0x0017
        Value: 021800012a
            Properties: 0x02
              Read (0x02)
            Value Handle: 0x0018
            Value UUID: Appearance (0x2a01)
        Handle: 0x0019
        Value: 021a00a62a
            Properties: 0x02
              Read (0x02)
            Value Handle: 0x001a
            Value UUID: Central Address Resolution (0x2aa6)
        Handle: 0x0029
        Value: 102a00372a
            Properties: 0x10
              Notify (0x10)
            Value Handle: 0x002a
            Value UUID: Heart Rate Measurement (0x2a37)
        Handle: 0x002c
        Value: 022d00382a
            Properties: 0x02
              Read (0x02)
            Value Handle: 0x002d
            Value UUID: Body Sensor Location (0x2a38)
        Handle: 0x002e
        Value: 082f00392a
            Properties: 0x08
              Write (0x08)
            Value Handle: 0x002f
            Value UUID: Heart Rate Control Point (0x2a39)
        Handle: 0x0031
        Value: 0a32008a2a
            Properties: 0x0a
              Read (0x02)
              Write (0x08)
            Value Handle: 0x0032
            Value UUID: First Name (0x2a8a)
        Handle: 0x0033
        Value: 0a3400902a
            Properties: 0x0a
              Read (0x02)
              Write (0x08)
            Value Handle: 0x0034
            Value UUID: Last Name (0x2a90)
        Handle: 0x0035
        Value: 0a36008c2a
            Properties: 0x0a
              Read (0x02)
              Write (0x08)
            Value Handle: 0x0036
            Value UUID: Gender (0x2a8c)

Signed-off-by: Manika Shrivastava <manika.sh@samsung.com>
Signed-off-by: Ayush Garg <ayush.garg@samsung.com>