feature - Add serverless tasks and spend

[GtheSheep]

Closes #36

This is very close to matching the invoice I received from Snowflake today, there are slight discrepancies in other spends generated by this package and my final bill though which there seems to be an issue related to?

Let me know if there's other models this should be included in also

[GtheSheep]

whoops! will add mock_data

[NiallRees]

whoops! will add mock_data

This is actually in our warehouse (too big for seeds!) - but if you’re able to provide a sample I can add it for the tests?

[ian-whitestone]

thanks for the contribution @GtheSheep ! much appreciated.

there are slight discrepancies in other spends generated by this package and my final bill though which there seems to be an issue related to?

@GtheSheep which categories are you seeing the discrepancies in?

There's the rounding issues mentioned in #25, then we've also seen storage not match up perfectly on 1/5 accounts we've validated against.

[GtheSheep]

Hey @ian-whitestone - anytime!
The for some categories, such as Cloud Services, Adjustments, the difference is like ~$1 on a few hundred so may be related to that.
The bigger differences are from Storage ~$10 on a couple hundred spend, and Compute ~$30 on a ~$10k spend.

In the grand scheme of things, not major. I could probably check the compute units to see if they match up just in case

[NiallRees]

This is ready to ship @GtheSheep - would you mind adding a changelog entry? Instructions here. We can add sample data at a later point, the logic looks sound.

[GtheSheep]

@NiallRees All done, will send some sample data over later 👌

[NiallRees]

🙌