Collect standardized "weights" for all `CanonicalItem` types

[armahillo]

**This is only a data collection issue -- no code changes necessary **

We need "official" weights measured for the following items (see process below):

• Adult Briefs (Large / X-Large)
• Adult Briefs (Medium / Large)
• Adult Briefs (Small / Medium)
• Adult Briefs (XXL)
• Adult Cloth Diapers (Large / XL / XXL)
• Adult Cloth Diapers (Small / Medium)
• Adult Incontinence Pads
• Bed Pads (Cloth)
• Bed Pads (Disposable)
• Bibs (Adult & Child)
• Cloth Diapers (AIO's / Pocket)
• Cloth Diapers (Covers)
• Cloth Diapers (Plastic Cover Pants)
• Cloth Diapers (Prefolds & Fitted)
• Cloth Inserts (for Cloth Diapers)
• Cloth Potty Training Pants / Underwear
• Cloth Swimmers (Kids)
• Disposable Inserts
• Kids (Newborn)
• Kids (Preemie)
• Kids (Size 1)
• Kids (Size 2)
• Kids (Size 3)
• Kids (Size 4)
• Kids (Size 5)
• Kids (Size 6)
• Kids L/XL (60-125 lbs)
• Kids Pull-Ups (2T-3T)
• Kids Pull-Ups (3T-4T)
• Kids Pull-Ups (4T-5T)
• Kids S/M (38-65 lbs)
• Swimmers
• Underpads (Pack)

Process

To get a good sampling, we need a minimum of 3 separate items of the same type weighed, and then averaged. 5 sample averages would be better, if that's possible. It's even better if the samples are taken from multiple brands (ie. Huggies 3T, Pampers 3T, Luvs 3T ...).

All weights need to be done in grams, for now.

If there is too much variance (ie. they're not obviously converging on a weight range within a small margin of error), then we can't set a standard weight (this is OK!)

If you can't weigh the products yourself, but you are able to get single-item-weights from the Internet for multiple product lines, that can also work.

Post any weights you find here, as a comment, and check off the box if the weight is "finalized" (ie. it's a composite average, per above).

Once we get these sorted, there will be a separate issue for actually registering them with the app.

[Nirvikalpa108]

Hi @armahillo, I would really like to help out. This is my first time contributing to this repo and I'm pretty new to coding so please forgive me if I ask really silly questions! I appreciate your help in advance!

Regarding this issue, I don't have access to all the nappies listed, but I can easily find the total weight of a package on Amazon and divide this by the number of nappies. I know this will not take into account the weight of the packaging, but I can look for products which have light plastic packaging so we could assume this is negligible?

For example, for Huggies Newborn Size 1 the total package weighs 2.3kg, there are 108 nappies per package, so we could consider each nappy to be 21 grams.

If this method is not reliable enough for this exercise then I totally understand! If there's anything else I can do to help by conducting internet research, please let me know!

Thank you so much 😃

[chaserx]

@Nirvikalpa108 Scraping them from Amazon is a good idea. I don't have enough context to know where the process requirement we need a _minimum_ of 3 separate items of the same type weighed, and then averaged originates.