Add catalogue items

[VKTB]

Description

This PR creates a catalogue items endpoint (accessible at /v1/catalogue-items) to which POST requests can be sent to create new catalogue items. The endpoint requires a name, description, catalogue_category_id, and catalogue item properties. Each catalogue item property object requires a name which is the name of the property as defined in the category and a value for it.

Testing instructions

• Review code
• Check Actions build
• Test creating a catalogue item in a leaf catalogue category
• Test creating a catalogue item in a non-leaf catalogue category
• Test creating a catalogue item with a duplicate name within a catalogue category
• Test creating a catalogue item with an invalid catalogue category ID
• Test creating a catalogue item with a non-existent catalogue category ID
• Test creating a catalogue item with missing mandatory catalogue item properties
• Test creating a catalogue item with missing non-mandatory catalogue item properties
• Test creating a catalogue item with invalid value types for the catalogue item properties

Agile board tracking

closes #7

[joshuadkitenge]

LGTM

[VKTB]

@joshuadkitenge I realised that I did not write any unit tests for this work so could you please review the code in the last three commits? Thanks

[joshuadkitenge]

Can you add the Manufacturer details:
manufacturer name
manufacturer url
Manufacturer address

So that a user can add the manufacturer details to the respective catalogue item

[VKTB]

Can you add the Manufacturer details: manufacturer name manufacturer url Manufacturer address

So that a user can add the manufacturer details to the respective catalogue item

Is it okay if I address this as part of #62 as it would be easier? If so then can I merge this PR or are you still reviewing it?

[joshuadkitenge]

Can you add the Manufacturer details: manufacturer name manufacturer url Manufacturer address
So that a user can add the manufacturer details to the respective catalogue item

Is it okay if I address this as part of #62 as it would be easier? If so then can I merge this PR or are you still reviewing it?

I have finished reviewing it. Yeah you can merge it and address the manufacturer as part of #62