OSHMEM/MCA/SPML/UCX: added pSync and pWrk arrays to team struct

[roiedanino]

1. SPML Base Infrastructure

• Added mca_spml_base_team_t structure with pSync and pWrk work arrays
• Added mca_spml_base_alloc_sync_array() and mca_spml_base_free_sync_array() helper functions
• Provides consistent symmetric heap allocation/deallocation across all SPML components

2. UCX SPML Implementation

• Modified mca_spml_ucx_team_t to inherit from mca_spml_base_team_t
• Updated team_split_strided() to allocate work arrays with proper error handling
• Updated team_destroy() to free work arrays

3. Predefined Teams Initialization

• Changed SHMEM_TEAM_WORLD and SHMEM_TEAM_SHARED to statically-allocated instances
• Added work array allocation during shmem_init()
• Added work array cleanup during shmem_finalize()