Update TS Config to support new decorators model definition

[johneatmon]

Based on this issue and this issue.

Update tsconfig.json:

• Add support for experimentalDecorators
• Bump module and moduleResolution to import @sequelize/core/decorators-legacy declarations properly

Update sscce-sequelize-7.ts:

• Add new Bar model to demonstrate new model definition example with decorators

[johneatmon]

Node 14 tests failed for syntax error (makes sense because ??= is Node 15+, IIRC). Though, curiously, SQLite test for Node 16 failed for the same reason.

Not sure if the other failures are related to my change; if someone wants to take a look and let me know, happy to update my PR. 😊

[WikiRik]

SQLite on Node 16 fails due to a typo, the following line should be using ${{ matrix.node}};

sequelize-sscce/.github/workflows/ci.yml

Line 26 in a8ce25f

node-version: 14.x

I fixed that in #261 but I forgot to look into the failing tests on there so we didn't merge that yet

[WikiRik]

I've updated #261 and the CI is passing there. Can you base your branch on that PR and see if the CI passes still with your updates?

[WikiRik]

@ephys did you close this on purpose? Or did this get auto-closed because you merged my PR?

[ephys]

It was closed by the merge of your PR as the target branch was deleted. This PR would need to target main but it's not letting me change it anymore :/

[WikiRik]

Ah yes, that's what I thought. The mobile app you mentioned that you closed as completed.

@johneatmon can you change the target branch to main and reopen this PR?

[johneatmon]

@WikiRik tbh I'm not sure how to do it with this existing pull, do I have to open a new PR?

[WikiRik]

@johneatmon not sure if you can just update the target branch and reopen. If not, you might need to open a new PR with the same changes.

[johneatmon]

@WikiRik re-opened in #272