[orc-rt] Add InProcessControllerAccess class. (#204976) Adds a Session::ControllerAccess implementation for in-process JIT setups, where the controller (LLVM-side) and the executor (orc-rt) live in the same address space. The two sides communicate through a refcounted C-ABI struct (Connection) of function pointers. The C-only interface avoids assuming a common C++ ABI between the two sides and supports symmetric, graceful disconnect: when either side calls Connection::Disconnect, in-flight cross-calls are drained and pending continuations are surfaced as out-of-band errors, after which further cross-calls fail cleanly. This is intended to be paired with a new ExecutorProcessControl implementation (llvm::orc::InProcessEPC) on the LLVM side, landing in a follow-up commit. Unit tests are included covering construction without connect, attach via Session, OnConnect-failure detach, successful and out-of-band-error call cases, and the disconnect-drains-pending behavior.
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