Hash Function Introduced to Produce Random Seeds to Enhance Default Carousel Randomness

[Jiatonglii22]

Closes #8986

[Feature]
Follow up on #8966 where randomness for carousels is generated on an hourly or daily basis. Modifications hope to accommodate for when a custom seed for a random carousel is not specified, in which case a random seed will be generated using a hash function on the carousel params. This is to prevent shared content orders for carousels on the same page.

Technical

• New parameter 'carousel_param's is added to function process_user_sort and params of the query are passed in when the function is called
• A Hash function is introduced in the SearchScheme class. It is an FNV-1a hash algorithm, commonly known for being simple and efficient, which is the main reason I picked it as the hash function is to generate random seeds.
• When a random order is specified but a custom seed is not introduced, the hash function computes a hash value that is then appended to the sort (only the first few letters), which will then become the random seed for the carousel.
• Most of the existing implementation is untouched

Testing

• Simple performance testing in the test_works.py which ensures that the hash function can generate hash values of large numbers of queries without taking too long.

Screenshot

Stakeholders

@RayBB @cdrini