[HGLDD] Emit HW struct and array types

The `EmitHGLDD` target can emit the necessary HGLDD JSON bits to encode arrays and structs when it sees `dbg.array` and `dbg.struct` operations, but it ignores `dbg.variable` ops with `!hw.array` and `!hw.struct` types. Supporting these native HW types and creating the corresponding JSON structures should be fairly straightforward.

Locate the EmitHGLDD implementation and inspect how dbg.array and dbg.struct operations become HGLDD JSON. Trace handling for dbg.variable operations with !hw.array and !hw.struct types, then verify that the corresponding native HW type structures are emitted consistently.

Written by the indexing model from the issue text.