Bugfix/ipconfig skips protocols

[AnthonyTTaylor]

This PR fixes a regression where protocols (and other mockable entities) inside #if blocks were not being discovered for mock generation. The issue was introduced by changes in PR #328 that made the visitor treat all non-fileMacro #if blocks as conditional import
blocks, even when they contained declarations like protocols.

Problem

For non-fileMacro #if blocks, the visitor now always:

1. Parses the block as a ConditionalImportBlock
2. Returns .skipChildren

This is correct for import-only blocks, but incorrect for blocks containing declarations. In those cases, protocols, classes, and other declarations are never visited, so mockable entities are not discovered.

Solution

Only treat an #if block as a conditional import block when it contains imports exclusively.

Added a new recursive method containsOnlyImports in EntityVisitor that checks if an IfConfigDeclSyntax contains only:

• import declarations
• nested #if blocks that themselves contain only imports

If the block contains anything else (like protocol, class, etc.), the visitor now returns .visitChildren so entity discovery proceeds normally.

Behavior After This Change

• Import-only #if blocks continue to be parsed as conditional imports
• #if blocks containing mockable protocols or other declarations are traversed
• Mixed blocks fall back to child traversal
• Nested #if blocks are handled recursively