Add "Copy to clipboard" button to the ZMI Test tab

[dataflake]

Closes #53

The button copies the ZSQL method's rendered SQL query output to the user's clipboard to help debugging. See #53 for a screen shot showing what that looks like.

[drfho]

hi @dataflake , button is a nice enhancement.
To make it work with one-liner-SQL I removed button-margins and monotonized borders for perfect fit.
And I made the upper part of the gui a little bit nicer, too.

[drfho]

BTW:
On starting Zope (5.13.1) I got a ModuleNotFoundError: No module named 'Shared.DC.ZRDB' after installing this branch of Products.ZSQLMethods as editable. May be connected to the new setup. Copilot helped me to make setup.py working. I will create a PR: #55
Please delete it, if it does not match to Your ideas about the new setup. Thank for your effort.

[drfho]

LGTM

[dataflake]

Thank you very much for taking the time for these nice improvements! See #55 about the errors you saw - you must use Zope 6 for the package to load correctly.

[dataflake]

P.S.: Use Zope 6 and update zc.buildout and setuptools to match the current recommendations (setuptools >= 78.1.1,<81 and zc.buildout >5.1)