Add the gram unit in the calories calculator

[teolemon]

Add the gram unit in the calories calculator in the product page.

[huzaifaiftikhar]

We already have gram, milligram, and kilogram unit in the calories calculator.

[teolemon]

We should add L, mL, I guess.

[pratyaksh1610]

@teolemon In this we need to add L, mL to the spinner only , anything else that's needs to be done ?

I would like to have some insight about the issue.

Thanks.