Refactor dependencies as submodules

[VinGarcia]

This release makes a very big refactor that allowed all the dependencies of each different adapter to be moved to different submodules.

This means two things:

Now if you want to use kpgx you would need to:

• go get github.com/vingarcia/ksql
• and go get github.com/vingarcia/ksql/adapters/kpgx

This is more work for the dev, but this also has one advantage (the second thing):

Now when importing ksql you only depend on what you use. This means that we can add support to several more databases without worrying that we would bloat the go.sum of our users with several dependencies they are not even using.

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This discussion was created from the release Refactor dependencies as submodules.