feat(typeorm): Upgrade Typeorm to V3

[juanzgc]

This PR references #2294 so all credit to Adrien for laying the groundwork.

Unfortunately, migrating Typeorm becomes very difficult as new code continues to be committed. Therefore, I created this PR which only focuses on the migration. This PR limits the amount of code changes in the Service and Repository repos to prevent as many painful merge conflicts.

I believe with this PR we can actually move forward with migrating to Typeorm V3.

The overall goal is to eventually fix: #2054 which I believe will improve Developer Experience when using the medusa-extender.

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[juanzgc]

@adrien2p Hopefully this helps a bit with the painful migration 😇 I tried my best to limit the amount of possible merge conflicts to make migrating actually doable

Thanks to your new buildQuery util this was made possibly 😄 It's also important to note we don't require updating the current format of relations since Typeorm V3 can handle both formats.

[mariusa]

@olivermrbl could this be considered, please? The longer it waits, the more painful to rebase. Thanks

[olivermrbl]

@mariusa Sorry for letting your message hang. We are discussing the migration this week and will hopefully be able to get back to you with a clear timeline for when this will be prioritized and eventually released :)

[olivermrbl]

@juanzgc We highly appreciate your contributions to the migration. We will use your branch as a foundation for continuing the work, but split it into smaller, isolated PRs, that are easier to review.

We expect the migration to be finalized mid next week.

Closing for now.

[juanzgc]

@olivermrbl Thanks Oliver for prioritizing the Typeorm migration!