SaiKrisna_add labor hours distribution backend

[saikrishnaraoyadagiri]

Description

Related PRS (if any):

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Main changes explained:

• Created laborHoursDistributionController.js
• Created laborHours.js
• Create laborHoursDistributionRouter.js
• Updated routes.js

How to test:

1. check into current branch
2. do npm install and ... to run this PR locally
3. Clear site data/cache
4. Go to postman to test the backend
5. hit the url to get the data : http://localhost:4500/api/labor-hours/distribution?start_date=2024-01-18&end_date=2024-12-31
6. it should display the data according to the dates selected from the laborhours collection
7. validate the data in collection and data showing in postman, it should be same
8. validate the data with optional field of category

Screenshots or videos of changes: