types: introduce `ucv_array_sort_r()` and `ucv_object_sort_r()`

Introduce two new functions for ordering arrays and object keys which
utilize a different compare callback signature and allow passing a user
provided pointer to the comparison callback.

The main advantages of the `ucv_*_sort_r()` flavors are the ability to
pass custom context to comparisons via the user data pointer and the
invocation of the comparison callback with direct `uc_value_t *` pointers
instead of opaque `const void *` arguments pointing to `uc_value_t *` or
json-c internal `struct lh_entry *` pointers respectively.

Suggested-by: Isaac de Wolff <idewolff@vincitech.nl>
[align naming and whitespace with the rest of the codebase, rename some
 variables for clarity, group sort related changes into two commits,
 drop constness from `uc_value_t *` compare function arguments]
Signed-off-by: Jo-Philipp Wich <jo@mein.io>

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