types: resolve upvalue values in arrays and objects

Some objects, such as wildcard module import namespace dictionaries may
contain upvalue type values. Extend `ucv_key_get()` to transparently
resolve such values before returning them to the caller in order to
avoid increasing the refcount of the upvalue itself, leading to a
memory leak later on when the VM indirectly dereferences it on upon
`uc_vm_stack_push()`, loosing the upvalue object reference itself
in the process.

This long standing leak was discovered while fixing another upvalue
related module import quirk.

Signed-off-by: Jo-Philipp Wich <jo@mein.io>

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