Refactor: Rename registerCallMethod* to registerOnSend* for consistent naming

[takaokouji]

Problem

The Ruby-to-blocks converter currently uses inconsistent naming for method call registration:

• registerCallMethod
• registerCallMethodWithBlock
• registerCallMyBlock

This naming is inconsistent with the newer registerOnXxx pattern introduced in #399/#400 and doesn't clearly convey that these methods handle onSend events (method calls).

Solution

Rename all registerCallMethod* functions to use consistent registerOnSend* naming:

Proposed Renamings

• registerCallMethod → registerOnSend
• registerCallMethodWithBlock → registerOnSendWithBlock
• registerCallMyBlock → registerOnSendMyBlock

Scope

This affects all converter files that use these registration methods:

• Motion converter
• Looks converter
• Sound converter
• Event converter
• Control converter
• Sensing converter
• Operators converter
• Variables converter
• MyBlocks converter
• Core infrastructure in index.js

Benefits

1. Consistency: Aligns with the registerOnXxx pattern established in refactor: migrate remaining onXxx handlers to register pattern #399/feat: implement registerOnXxx infrastructure for Ruby-to-blocks converter #400
2. Clarity: Makes it clear these methods handle onSend events (method calls)
3. Maintainability: Consistent naming improves code readability
4. Semantic Accuracy: Better reflects the actual functionality

Implementation Plan

1. Create feature branch refactor/register-on-send-naming
2. Refactor each converter category individually with separate commits
3. Update core infrastructure in index.js
4. Ensure all tests pass
5. Update documentation if needed

Acceptance Criteria

• All registerCallMethod* functions renamed to registerOnSend*
• All converter files updated to use new method names
• Core infrastructure updated in index.js
• All tests pass
• No functional changes - purely a refactoring
• Consistent naming pattern across the codebase

Related Issues

• refactor: migrate remaining onXxx handlers to register pattern #399 - Original registerOnXxx infrastructure design
• feat: implement registerOnXxx infrastructure for Ruby-to-blocks converter #400 - registerOnXxx infrastructure implementation