feat (rql): add ilike and notilike support

[paanSinghCoder]

Add ilike and notilike operators to the validStringOperations list in the RQL parser. This enables case-insensitive pattern matching support for string fields, complementing the existing like and notlike operators.

Related PR - raystack/frontier#1472

Summary by CodeRabbit

• New Features
  • Extended query string filtering to support additional case-insensitive operators ilike and notilike alongside existing filter options, providing more flexible search capabilities.

[coderabbitai]

📝 Walkthrough

Walkthrough

Extended string filter operator validation in the RQL parser to support case-insensitive variants ilike and notilike. The change expands the validStringOperations list while maintaining existing validation logic and control flow.

Changes

Cohort / File(s)	Summary
String Operator Validation rql/parser.go	Added ilike and notilike case-insensitive operator variants to the validStringOperations validation set alongside existing like and notlike operators.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~3 minutes

Poem

🐰 A parser's delight, both subtle and bright,
Case-insensitive variants now in sight!
Like becomes ilike, a flexible friend,
Where queries bend, there's no end—
More operators to parse with glee! ✨

🚥 Pre-merge checks | ✅ 3

✅ Passed checks (3 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly and concisely summarizes the main change: adding ilike and notilike operators to support case-insensitive string filtering in the RQL parser.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.

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✨ Finishing Touches

📝 Generate docstrings

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch feat/add-ilike-notilike-support

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[coderabbitai]

Actionable comments posted: 1

🤖 Prompt for all review comments with AI agents

Verify each finding against the current code and only fix it if needed.

Inline comments:
In `@rql/parser.go`:
- Line 12: Add end-to-end tests for the new case-insensitive string operators by
adding test cases for "ilike" and "notilike" in parser_test.go (exercise the
parser/validation path the same way existing "like"/"notlike" tests do),
ensuring they parse and validate successfully against validStringOperations;
also update rql/README.md to list "ilike" and "notilike" as supported string
operators and note that correct SQL generation depends on the downstream SQL
builder (e.g., confirm GoQU or your SQL layer supports ILIKE/case-insensitive
comparisons).

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 675c3b5b-0387-4442-bb92-b7c012bb09ab

📥 Commits

Reviewing files that changed from the base of the PR and between abdfc17 and 3bd411e.

📒 Files selected for processing (1)

• rql/parser.go