Added support for On-Demand Capacity, local DynamoDB instance and rewriting the tables when importing the schema

[antonpkazakov]

I must also mention @jilykate here, as she contributed at the beginning of this change.

[mifi]

Hi! thanks for the PR
Am I right that there are four changes you want?

1. Set custom endpoint
2. Delete existing table before import
3. Supporting some table types that we are not already supporting normal export/import on? (On-Demand Capacity)
4. Supporting forced rewriting of some attributes in the JSON before importing?

Here's what i'm thinking:

1. I'm happy with merging
2. Isn't it better that we implement a separate delete table command in dynamodump? Then the user can call it before calling import if they want to
3. Need to explain the logic a bit
4. I'm not sure if this is something that's commonly needed. I think I want to leave it open for feedback from other users.

Maybe you can make a separate PRs for the different features?

[antonpkazakov]

Yep, these are exactly the 4 changes I'd like to implement. The use case: a local (dev env) import of an existing DynamoDB table with on-demand capacity that doesn't exist locally.
Not sure if it's very common by itself. However, the described features might as well be rather useful separately from each other.

Deleting the table as a separate command may also be useful, I agree. However, what I wanted to implement was deleting the table if needed in the import command (so that we don't care if the table exists while importing and don't even need to check). So I'd say that it would be another, the 5th feature :)

I think separating the features into different PRs could make sense but it would take more time. I'm good with waiting for more feedback from others (maybe we could tag them here to get it earlier), but see more sense in shipping these small features as a bundle, since the bundle is not so big.

Which parts of the logic would you like me to explain more? Would code comments do or the README file modifications are needed in your opinioin?

[titopixelfusion]

This would be great, I need to import to a local database using the docker image, but there is no way to set the endpoint url

[mifi]

Hi again. I just did a rewrite to ESM. If someone wants to address my concerns above and create separate PR's I'm happy to merge