Inventory properties via Assembly schema

This commit implements Redfish Assembly schema.
This schema will be used to publish inventory data for FRUs which are
attached to a given Chassis and does no

Inventory properties via Assembly schema

This commit implements Redfish Assembly schema.
This schema will be used to publish inventory data for FRUs which are
attached to a given Chassis and does not map to any specific schema
definition.

The properties which are published in this commit are LocationCode,
SparePartNumber, Model, SerialNumber and PartNumber.

One of the major use case to publish these properties via redfish is for
anyone to identify the inventory and its location in the system, which
in turn will help them in repair/replacement related to that FRU.

The validator has been executed on the change and no error has been
found.
As this has been tested on a development image some fields are empty
in the below pasted output for which warning was thrown by validator but
no errors.

Sample Output with [1]:
```
{
"@odata.id": "/redfish/v1/Chassis/chassis/Assembly",
"@odata.type": "#Assembly.v1_5_1.Assembly",
"Assemblies": [
{
"@odata.id": "/redfish/v1/Chassis/chassis/Assembly#/Assemblies/0",
"@odata.type": "#Assembly.v1_5_1.AssemblyData",
"Location": {
"PartLocation": {
"ServiceLabel": "U78DA.ND0.1234567-D0"
}
},
"Manufacturer": "",
"MemberId": "0",
"Model": "",
"Name": "base_op_panel_blyth",
"PartNumber": "",
"SerialNumber": "",
"Status": {
"Health": "OK",
"State": "Absent"
}
},
{
"@odata.id": "/redfish/v1/Chassis/chassis/Assembly#/Assemblies/1",
"@odata.type": "#Assembly.v1_5_1.AssemblyData",
"Location": {
"PartLocation": {
"ServiceLabel": "U78DA.ND0.1234567-D1"
}
},
"Manufacturer": "",
"MemberId": "1",
"Model": "6B86",
"Name": "lcd_op_panel_hill",
"PartNumber": "PN12345",
"SerialNumber": "YL6B86010000",
"Status": {
"Health": "OK",
"State": "Enabled"
}
}
],
"Assemblies@odata.count": 2,
"Id": "Assembly",
"Name": "Assembly Collection"
}
```

[1] https://gerrit.openbmc.org/c/openbmc/openbmc/+/83907

Change-Id: I2d462340fe1a0b0eb387697f0ff70fcafde3f8d9
Signed-off-by: Sunny Srivastava <sunnsr25@in.ibm.com>
Signed-off-by: Ninad Palsule <ninad@linux.ibm.com>
Signed-off-by: Myung Bae <myungbae@us.ibm.com>

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