[Refactor] Enhance MergeSharedMemoryAllocations Pass for Improved Liveness Analysis and Scope Management

[LeiWang1999]

• Introduced a new StmtAttr structure to track the scope level of statements, enhancing the liveness analysis process.
• Updated the UpdateStmtAttr function to manage statement attributes effectively during memory allocation visits.
• Modified the VisitStmt_ methods to utilize the new scope level tracking, ensuring accurate memory access patterns.
• Refactored the LivenessAnalysis and PlanMemory functions to incorporate statement attributes, improving the handling of gen and kill points in memory management.
• Added a new helper function allow_warp_specialized in phase.py to conditionally enable warp specialization based on pass context and target, addressing potential bugs in the MergeSharedMemoryAllocations pass.
• Enhanced the OptimizeForTarget function to conditionally apply the MergeSharedMemoryAllocations pass based on warp specialization settings, improving robustness in memory allocation strategies.

[github-actions]

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