feat: simplify withSchema API

[ephys]

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Description Of Change

As a follow up to #14337. While we're renaming Model.schema to Model.withSchema, we might as well simplify its API. I changed it from:

MyModel.schema('public');
MyModel.schema('public', /* schema delimiter */ '.');
MyModel.schema('public', { schemaDelimiter: '.' });

to

MyModel.withSchema('public');
MyModel.withSchema({ schema: 'public', schemaDelimiter: '.' });

Not a breaking change because .schema keeps its old API and .withSchema hasn't been released yet

[WikiRik]

I have one question, but it's non-blocking

[github-actions]

🎉 This PR is included in version 7.0.0-alpha.11 🎉

The release is available on:

• npm package (@release-v7 dist-tag)
• GitHub release

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