Fix temporary expressions in reverse mode

[MihailMihov]

This PR aims to fix issues with temporary expressions in reverse mode (like in the included tests), but some of the tests are still failing, so I'm marking it as a draft

fixes #917

[github-actions]

clang-tidy review says "All clean, LGTM! 👍"

[vgvassilev]

@MihailMihov, can you rebase?

[MihailMihov]

@MihailMihov, can you rebase?

I don't really have anything ready on this, because I need the constructors in reverse mode to work before I can finish this. If you want I can close this for now and open another one when it's ready?

[vgvassilev]

Let's keep this opened. @parth-07 may have some good news on the ctor support in reverse soon.

[vgvassilev]

I am wondering what's the fate of this PR?

[MihailMihov]

I am wondering what's the fate of this PR?

For some time it was blocked on not having support for constructors in reverse-mode, but now that that has been merged I'll try rebasing it and seeing if the tests still fail and why.

[parth-07]

For some time it was blocked on not having support for constructors in reverse-mode, but now that that has been merged

The tests should still fail. We added support for custom derivatives for constructors. Clad cannot automatically differentiate constructors so far.