[flang][debug] Support derived type components with box types. (#109424)
Our support for derived types uses `getTypeSizeAndAlignment` to
calculate the offset of the members. The `fir.box` was not supported in
that function. It meant that any member which required descriptor was
not supported in the derived type.
We convert the type into an llvm type and then use the DataLayout to
calculate the size/offset of a member. There is no dependency on
`getTypeSizeAndAlignment` to get the size of the types.
There are 2 other changes in this PR:
1. The `recID` field is used to handle cases where we have a member
references its parent type.
2. A type cache is maintained to avoid duplication. It is also needed
for circular reference case.
Fixes #108001.
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