impl inline refactor code actions

[asukaminato0721]

Summary

Fixes part of #364

Added conservative inline refactor code actions (variable, call‑site method, and parameter) with safety checks, wired them into LSP capabilities and the code‑action pipeline.

Inline method replaces the selected call only (doesn’t delete the definition). Inline parameter requires a single local call site and removes the parameter + argument.

https://www.jetbrains.com/help/pycharm/inline.html#inline-variable-python

Test Plan

added focused unit tests in the LSP code‑actions suite.

[Copilot]

Pull request overview

This pull request implements three inline refactoring code actions for Python: inline variable, inline method (call-site only), and inline parameter. The implementation includes comprehensive safety checks to ensure conservative refactoring operations.

Key Changes

• Added inline variable refactoring that replaces all references with the assigned value and removes the assignment
• Added inline method refactoring that replaces a single call site with the method body (preserving the method definition)
• Added inline parameter refactoring that requires exactly one call site, removes the parameter, and inlines the argument value

Reviewed changes

Copilot reviewed 7 out of 7 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
pyrefly/lib/test/lsp/code_actions.rs	Added test helpers and unit tests for the three new inline refactoring actions
pyrefly/lib/state/lsp/quick_fixes/mod.rs	Added module declarations for the three new inline refactoring implementations
pyrefly/lib/state/lsp/quick_fixes/inline_variable.rs	Implemented inline variable with safety checks for recursion, nested scopes, and disallowed expressions
pyrefly/lib/state/lsp/quick_fixes/inline_parameter.rs	Implemented inline parameter with single call site requirement and parameter usage validation
pyrefly/lib/state/lsp/quick_fixes/inline_method.rs	Implemented inline method for single call sites with parameter mapping and substitution
pyrefly/lib/state/lsp.rs	Added public API methods to expose the three inline code actions to the LSP layer
pyrefly/lib/lsp/non_wasm/server.rs	Registered REFACTOR_INLINE capability and wired the three actions into the code action pipeline

---

💡 Add Copilot custom instructions for smarter, more guided reviews. Learn how to get started.

[github-actions]

According to mypy_primer, this change doesn't affect type check results on a corpus of open source code. ✅