Add `ABIAdapter` / `DispatchTrampoline` and use for `@ccallable` / `@cfunction`#62245

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topolarity:ct/abi-adapter-caches

Commits on Jul 17, 2026

codegen: drop the redundant nargs field from jl_abi_t

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typemap: add jl_typemap_list_t record lists

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codegen: add interned ABIAdapter cache and serialization

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codegen: add DispatchTrampoline cache and resolver

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codegen: move @cfunction/@ccallable to ABIAdapter/DispatchTrampoline; delete cfuncdata

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loader: add JULIA_LOAD_CODEGEN_LIB and test @cfunction without codegen

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