refactor!: proof_of_sql_parser::intermediate_ast::Identifier with sqlparser::ast::Ident in the proof-of-sql crate

[varshith257]

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Rationale for this change

This PR addresses the need to replace the proof_of_sql_parser::Identifier with the sqlparser::ast::Ident in the proof-of-sql crate as part of a larger transition toward integrating the sqlparser .

This change is a subtask of issue #235, with the main goal of streamlining the repository by switching to the sqlparser crate and gradually replacing intermediary constructs like proof_of_sql_parser::intermediate_ast with sqlparser::ast.

What changes are included in this PR?

• All instances of proof_of_sql_parser::Identifier have been replaced with sqlparser::ast::Ident

• A few of them required an identifier (e.g. Expression::Column, etc..), which is dependent on the Identifier and will be migrated at the refactoring of Exprs.

• Every usage of Identifier has been updated to maintain the original functionality, ensuring no changes to the logic or behavior.

• The breaking change here is that Ident doesn't support Copy trait so we have needed the clones in the places where values are moved

• Deleted the test we_cannot_convert_a_record_batch_if_it_has_repeated_column_names because the sqlparser now differentiates between uppercase and lowercase identifiers. Case normalization is no longer applied and sqlparser treats a and A as distinct identifiers.

• Examples are updated to align with sqlparser's case-sensitive behavior.

Are these changes tested?

Yes

Part of #235

[iajoiner]

@varshith257 Really thanks for your hard work! This is mostly good.
One comment:
Please remove changes to the examples. Changes in the rest of the code base should be sufficient in getting them to work.

[JayWhite2357]

Thanks for this PR!
Two requests, and then I'll merge it.

1. Don't normalize the identifier names. Leave them as is.
2. Don't panic when converting Ident to Identifier. Instead return an Error. Not every valid Ident is a valid Identifier.

[iajoiner]

@JayWhite2357 In terms of WASM sizes I think we can proceed with the changes.

[iajoiner]

@varshith257 Thanks again for your hard work!

[github-actions]

🎉 This PR is included in version 0.63.0 🎉

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