feat(oracle): added support for connectString

[hjamil-24]

• feat: added support for connectString
  Co-authored-by: Hasan Jamil

Pull Request Checklist

• Have you added new tests to prevent regressions?
• If a documentation update is necessary, have you opened a PR to the documentation repository?
• Did you update the typescript typings accordingly (if applicable)?
• Does the description below contain a link to an existing issue (Closes #[issue]) or a description of the issue you are solving?
• Does the name of your PR follow our conventions?

Description Of Change

This is a feature addition for Oracle Database to allow Sequelize constructor to use connectString for authentication.
The additional way to authenticate by this change is as follow:

const sequelize = new Sequelize({dialect: 'oracle', username: 'demouser', password: 'password', dialectOptions: {connectString: 'orcl1'}});

The link to docs PR: sequelize/website#266

[ephys]

Is there an integration test you can add for this?

[cjbj]

@hjamil-24 @ephys where is this PR at ? :) I've been waiting on this before doing some social media stuff.

[ephys]

The last change request is small, once it's done I think this is good to go!

[ephys]

Nice work :)

[cjbj]

Thanks everyone.