Add method for accessing #transactionCls Sequelize v7

[nachobascar]

Issue Creation Checklist

• I understand that my issue will be automatically closed if I don't fill in the requested information
• I have read the contribution guidelines

Feature Description

Describe the feature you'd like to see implemented

I would like to get a way of accessing the #transactionCls property of Sequelize.

Describe why you would like this feature to be added to Sequelize

Right now, I find myself switching from Sequelize v6 to v7, due to their better handling of async errors. The only problem I found myself on is that, as now the method Sequelize.useCLS doesn't exist anymore, I'm not able to run unmanaged transactions with CLS.

I understand that this is wanted, as stated in the documentation, but I don't understand why, as this feature allows great flexibility to the ORM.

My personal use for it is when creating a middleware with ExpressJs for having a transaction enclose each request, and I haven't found the way to correctly implement this with managed transactions. With unmanaged transactions it is perfectly makeable, but in this new version I have to manually set the transaction on each query, which is not ideal.

Is this feature dialect-specific?

• No. This feature is relevant to Sequelize as a whole.
• Yes. This feature only applies to the following dialect(s):

Would you be willing to resolve this issue by submitting a Pull Request?

• Yes, I have the time and I know how to start.
• Yes, I have the time but I will need guidance.
• No, I don't have the time, but my company or I are supporting Sequelize through donations on OpenCollective.
• No, I don't have the time, and I understand that I will need to wait until someone from the community or maintainers is interested in implementing my feature.

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