feat: mark all possible classes as readonly

[simPod]

Summary by CodeRabbit

• Refactor
  • Updated multiple classes throughout the project to be immutable after construction, enhancing reliability and predictability.
  • Improved type declarations for certain constants to provide stricter type safety.

[coderabbitai]

Caution

Review failed

The pull request is closed.

Walkthrough

The changes convert numerous class declarations across the codebase to use the readonly modifier, enforcing immutability of all class properties after construction. In a few cases, constant declarations are also explicitly typed. No changes were made to methods, logic, or control flow in any of the affected classes.

Changes

Cohort / File(s)	Change Summary
Client Classes src/Client/Http/RequestFactory.php, src/Client/Http/RequestOptions.php, src/Client/Http/RequestSettings.php, src/Client/PsrClickHouseAsyncClient.php, src/Client/PsrClickHouseClient.php	All classes updated to use the readonly modifier, making their properties immutable after construction. No other changes.
Format Classes src/Format/Json.php, src/Format/JsonCompact.php, src/Format/JsonEachRow.php, src/Format/Null_.php, src/Format/Pretty.php, src/Format/PrettySpace.php, src/Format/RowBinary.php, src/Format/TabSeparated.php	All classes updated to final readonly class, enforcing immutability. No changes to methods or logic.
Logger Classes src/Logger/LoggerChain.php, src/Logger/PsrLogger.php	Both logger classes updated to final readonly class, making properties immutable after construction. No other changes.
Output Classes src/Output/Basic.php, src/Output/Json.php, src/Output/JsonCompact.php, src/Output/JsonEachRow.php, src/Output/Null_.php	All output classes updated to final readonly class, enforcing immutability. No other logic changes.
Param Registry src/Param/ParamValueConverterRegistry.php	Class updated to final readonly class. Constant CaseInsensitiveTypes now explicitly typed as array. No logic changes.
Snippet Classes src/Snippet/CurrentDatabase.php, src/Snippet/DatabaseSize.php, src/Snippet/Parts.php, src/Snippet/ShowCreateTable.php, src/Snippet/ShowDatabases.php, src/Snippet/TableSizes.php, src/Snippet/Version.php	All snippet classes updated to final readonly class, making properties immutable. No other changes.
SQL Utility Classes src/Sql/Escaper.php, src/Sql/Expression.php, src/Sql/SqlFactory.php	All SQL utility classes updated to final readonly class, enforcing immutability. No changes to logic or methods.
Test Utility tests/ClickHouseVersion.php	Class updated to final readonly class. Constant EnvName now explicitly typed as string. No logic changes.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~8 minutes

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📜 Recent review details

Configuration used: CodeRabbit UI
Review profile: CHILL
Plan: Pro

📥 Commits

Reviewing files that changed from the base of the PR and between 5caa6ff and b81d5d9.

📒 Files selected for processing (32)

• src/Client/Http/RequestFactory.php (1 hunks)
• src/Client/Http/RequestOptions.php (1 hunks)
• src/Client/Http/RequestSettings.php (1 hunks)
• src/Client/PsrClickHouseAsyncClient.php (1 hunks)
• src/Client/PsrClickHouseClient.php (1 hunks)
• src/Format/Json.php (1 hunks)
• src/Format/JsonCompact.php (1 hunks)
• src/Format/JsonEachRow.php (1 hunks)
• src/Format/Null_.php (1 hunks)
• src/Format/Pretty.php (1 hunks)
• src/Format/PrettySpace.php (1 hunks)
• src/Format/RowBinary.php (1 hunks)
• src/Format/TabSeparated.php (1 hunks)
• src/Logger/LoggerChain.php (1 hunks)
• src/Logger/PsrLogger.php (1 hunks)
• src/Output/Basic.php (1 hunks)
• src/Output/Json.php (1 hunks)
• src/Output/JsonCompact.php (1 hunks)
• src/Output/JsonEachRow.php (1 hunks)
• src/Output/Null_.php (1 hunks)
• src/Param/ParamValueConverterRegistry.php (1 hunks)
• src/Snippet/CurrentDatabase.php (1 hunks)
• src/Snippet/DatabaseSize.php (1 hunks)
• src/Snippet/Parts.php (1 hunks)
• src/Snippet/ShowCreateTable.php (1 hunks)
• src/Snippet/ShowDatabases.php (1 hunks)
• src/Snippet/TableSizes.php (1 hunks)
• src/Snippet/Version.php (1 hunks)
• src/Sql/Escaper.php (1 hunks)
• src/Sql/Expression.php (1 hunks)
• src/Sql/SqlFactory.php (1 hunks)
• tests/ClickHouseVersion.php (1 hunks)

✨ Finishing Touches

• 📝 Generate Docstrings

🧪 Generate unit tests

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch readonly

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 94.66%. Comparing base (5caa6ff) to head (b81d5d9).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #303   +/-   ##
=======================================
  Coverage   94.66%   94.66%           
=======================================
  Files          40       40           
  Lines         750      750           
=======================================
  Hits          710      710           
  Misses         40       40           

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