Make GPUInterpreter extensible #1403

Job	Run time
Julia 1.11 x86_64-linux-gnuassert	4m 5s
Julia 1.10 - ubuntu-latest - x64	1m 34s
Julia 1.11 x86_64-linux-gnuassert --opaque-pointers	3m 55s
Julia 1.10 - macOS-latest - x64	1m 57s
Julia 1.10 - windows-latest - x64	2m 14s
Julia pre - ubuntu-latest - x64	3m 12s
Julia pre - macOS-latest - x64	3m 30s
Julia pre - windows-latest - x64	3m 47s
Julia nightly - ubuntu-latest - x64	54s
Julia nightly - macOS-latest - x64	2m 3s
Julia nightly - windows-latest - x64	1m 29s
Julia 1.10 --opaque-pointers - ubuntu-latest - x64	1m 47s
Julia 1.10 --opaque-pointers - macOS-latest - x64	2m 27s
Julia 1.10 --opaque-pointers - windows-latest - x64	2m 9s
Julia pre --opaque-pointers - ubuntu-latest - x64	3m 4s
Julia pre --opaque-pointers - macOS-latest - x64	5m 29s
Julia pre --opaque-pointers - windows-latest - x64	3m 54s
	47m 30s

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