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box: fix _func id overflow

Each time one used the `box.schema.func.create`, the primary key of
the resulted function increased because of the
`_func:auto_increment`. Now the new key is chosen by the
`generate_func_id` in Lua and `OP_GenFuncid` SQL opcode, both implemented
using the new `box_generate_func_id` function that shares logic with
`box_generate_space_id`. Hence we are scanning the entire range of
possible ids `[0, BOX_FUNCTION_MAX)` before we are returning an
error.

Fixes #11849
Fixes #11851
NO_DOC=bugfix

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