Shadow Zarith exception-raising function in the environment

Context

This MR is, like !9521 (closed), about making the protocol safer by avoiding involuntary calls to exception-raising functions from the Zarith library. Unlike !9521 (closed), the shadowing happens in the environment instead of the protocol.

In this MR, only one function is handled: Z.ediv_rem which raises an exception in case of division by zero. Replacing other exception-raising functions by tzresult ones will be the topic of future MRs.

Manually testing the MR

Checklist

• Document the interface of any function added or modified (see the coding guidelines)
• Document any change to the user interface, including configuration parameters (see node configuration)
• Provide automatic testing (see the testing guide).
• For new features and bug fixes, add an item in the appropriate changelog (docs/protocols/alpha.rst for the protocol and the environment, CHANGES.rst at the root of the repository for everything else).
• Select suitable reviewers using the Reviewers field below.
• Select as Assignee the next person who should take action on that MR