Only show categories with cookies attached and don't load cookie manager when no cookies are defined

[shazmasiddiqui]

Partial pull Request for Issue #14

Summary of Changes

• Cookie manager will not load in frontend if there are no cookies defined
• Consent banner modal in the frontend will only show the categories which have cookies attached

Testing Instructions

• Don't create any cookies and check in the frontend the cookie manager settings button shouldn't be visible
• Create cookies and add them to any category, these categories should be visible in consent banner model in the frontend
• Create categories but don't add any cookies to them, these categories should not be shown in consent banner model in the frontend

Actual result BEFORE applying this Pull Request

• Cookie manager settings button is shown in the frontend even if there are no cookies defined
• Categories which don't have any cookies attached to them are also shown in the consent banner model

Expected result AFTER applying this Pull Request

• Cookie manager settings button is only visible when at least one cookie is defined
• Only categories which have at least one cookie attached to them are shown in the consent banner model

[roland-d]

@shazmasiddiqui There is one issue with your PR. The frontend shows the category ID instead of the category name:

[rjharishabh]

Issue #15

[fancyFranci]

I wasn't able to reproduce the issue, so I merged it. When it is still there, we will fix it in another PR. Thanks for all the work!