Deprecate `term_from_int32` and `term_from_int64`

[pguyot]

Continuation of:

• #1896

Introduce term_from_int28 that is always safe and update usage in main library and generic_unix port

These changes are made under both the "Apache 2.0" and the "GNU Lesser General Public License 2.1 or later" license terms (dual license).

SPDX-License-Identifier: Apache-2.0 OR LGPL-2.1-or-later