Support for with-redefs

[cldwalker]

Hi. I see #175 and #176 attempted to implement with-redefs but then disabled it. It would be awesome to include it for babashka given how powerful a testing tool it is

Is your feature request related to a problem? Please describe.
I'm looking to writing tests in babashka that use with-redefs. I'd also like to pull in this testing library which relies on with-redefs

Describe the solution you'd like
A working with-redefs

Describe alternatives you've considered
I'm not aware of alternatives to this core fn

Additional context
If you describe what's needed to make this work, perhaps someone can help with this. I could try to take a shot at it some day

Cheers

[liquidz]

I've wrote a macro with features similar to with-redefs for babashka, but it would be more happy to support officially :)
https://github.com/liquidz/vim-iced/blob/64a15c893c0a92f9a33927100ee09872e5d21c3e/test/clj/command/iced/core_test.clj#L8-L14

[cldwalker]

Look forward to trying this. Thanks!