refactor: remove query! macro and replace

[Harsh9485]

Please be sure to look over the pull request guidelines here: https://github.com/spaceandtimelabs/sxt-proof-of-sql/blob/main/CONTRIBUTING.md#submit-pr.

Please go through the following checklist

• The PR title and commit messages adhere to guidelines here: https://github.com/spaceandtimelabs/sxt-proof-of-sql/blob/main/CONTRIBUTING.md. In particular ! is used if and only if at least one breaking change has been introduced.
• I have run the ci check script with source scripts/run_ci_checks.sh.

Rationale for this change

Fixes #236
/claim #236

This PR addresses part 1 of #236 by removing the use of the query! macro in tests and replacing it with explicit construction of the query expressions.

What changes are included in this PR?

• Removed instances of the query! macro from the test files, specifically in sxt-proof-of-sql/crates/proof-of-sql/src/sql/parse/query_expr_tests.rs
• Replaced the macro usage with explicit query construction

Are these changes tested?

Yes

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[akhilender-bongirwar]

@Harsh9485, The part 1 and part 3 of this issue are already fixed in my PR #261