Add support for multi-line array shape annotations

[dereuromark]

Summary

• Adds collectMultiLineType() and parseCollectedTypeContent() helper methods to CommentingTrait for parsing type annotations that span multiple lines
• Updates DocBlockParamSniff to detect and properly handle multi-line array shape annotations
• Adds test cases covering various multi-line scenarios (nested generics, array shapes with multiple fields, mixed single and multi-line params)

This allows PHPDoc annotations like:

/**
 * @param array<string, array{
 *   msgid: string,
 *   msgid_plural: string|null,
 *   msgctxt: string|null,
 *   references: array<string>,
 *   comments: array<string>
 * }> $strings Extracted strings
 */

Test plan

• Run existing DocBlockParamSniffTest - passes
• Run composer cs-check - passes
• Run composer stan - passes
• Run composer test - all 82 tests pass

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