Alan-Jowett / libbtf / 22200640262

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Reject BTF maps with incomplete key/value types (#189)

When parsing BTF map definitions, if a key or value field points to an
incomplete type (such as BTF_KIND_FWD), get_size() returns 0. Previously
this was silently accepted, leading to invalid map definitions.

This change:
- Detects when key/value size cannot be determined (size == 0)
- Throws an error with the map name and type name for easier diagnosis
- Makes get_type_name() public to support informative error messages
- Adds tests for both key and value forward declaration rejection

This matches libbpf behavior which rejects maps where btf__resolve_size()
fails for key/value types.

Signed-off-by: Alan Jowett <alan.jowett@microsoft.com>
Co-authored-by: Alan Jowett <alan.jowett@microsoft.com>
Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

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