Add schema validation

[HeinrichvonStein]

This PR addresses #431 (comment).

Add validation to the Schema constructor.

• We need to validate that the tables have a name here because a user could pass in an array Tables that don't have a name because they are using the V2 syntax. Therefore, 'convertToClassicTables' won't be called on the tables resulting in a runtime error.

Additional Tests:

• Added a new Schema test which checks that an error is thrown when a Schema is created incorrectly.

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[HeinrichvonStein]

Converting to a draft for now due to validation oversite