Added functionality for add certificate, add product, and edit certificate buttons.

[saharbueno]

• Added Add Certificate and Add Product buttons
• When the button is pressed -> popup opens, and the user can add all details, the user can cancel (which closes the popup and clears input), or the user can add the item (adds input to the database, adds input to the row, and closes the popup)
• Added Edit Certificate button

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[shraddha55]

Looks great!

[ShaktidharK1997]

Looks good!

suggestion : You can change the input type of expiration_date, last_audited and last_exported to date instead of text in the product / certificate forms

[ShaktidharK1997]

useEffect(() => { fetchSupplierData() fetchProductData() fetchCertificateData() }, [supplierData])

@saharbueno I noticed there's a loop in this statement. It's causing repeated API calls to the backend because it checks for supplierData as a dependency, and in the hook, supplierData gets fetched and updated. Could we change the dependency to avoid this loop?