Refactor external semaphore scaffolding

[gorazd-sumkovski-arm]

Remove the CREATE_OPENCL_SEMAPHORE macro and use derived class instantiations of the clExternalSemaphore class, rather than base pointers to derived class objects.

Remove the default argument for queryParamName in check_external_semaphore_handle_type().

Move check_external_semaphore_handle_type() checks to constructors of clExternalImportableSemaphore and clExternalExportableSemaphore, rather than manually making the check before creating an external semaphore.

[joshqti]

This passes for us, looks good

[nikhiljnv]

Merging as agreed in memory subgroup call on April 15th, 2025.