[RFC] Improve 'Could not resolve dependencies' error messages

Cabal is unfortunately infamous for its hard-to-decode error message when it can't find the build plan for the package. Experienced `cabal-install` users can decode them but even for them, it takes some time.

Here is one example:

```bash
$ cabal build
Resolving dependencies...
cabal: Could not resolve dependencies:
[__0] trying: colourista-0.1.0.1 (user goal)
[__1] trying: base-4.16.3.0/installed-4.16.3.0 (dependency of colourista)
[__2] trying: sauron-0.0.0.0 (user goal)
[__3] next goal: time (dependency of sauron)
[__3] rejecting: time-1.11.1.1/installed-1.11.1.1 (conflict: sauron =>
time^>=1.7)
[__3] skipping: time-1.12.2, time-1.12.1, time-1.12, time-1.11.1.2,
time-1.11.1.1, time-1.11.1, time-1.11, time-1.10, time-1.9.3, time-1.9.2,
time-1.9.1, time-1.9, time-1.8.0.4, time-1.8.0.3, time-1.8.0.2, time-1.8.0.1,
time-1.8 (has the same characteristics that caused the previous version to
fail: excluded by constraint '^>=1.7' from 'sauron')
[__3] rejecting: time-1.7.0.1 (conflict: base==4.16.3.0/installed-4.16.3.0,
time => base>=4.7 && <4.13)
[__3] skipping: time-1.7, time-1.6.0.1, time-1.6, time-1.5.0.1 (has the same
characteristics that caused the previous version to fail: excludes 'base'
version 4.16.3.0)
[__3] rejecting: time-1.5 (conflict: sauron => time^>=1.7)
[__3] skipping: time-1.4.2, time-1.4.1, time-1.4.0.2, time-1.4.0.1, time-1.4,
time-1.3, time-1.2.0.5, time-1.2.0.4, time-1.2.0.3, time-1.2.0.2,
time-1.2.0.1, time-1.2, time-1.1.4, time-1.1.3, time-1.1.2.4, time-1.1.2.3,
time-1.1.2.2, time-1.1.2.1, time-1.1.2.0, time-1.0, time-1.13 (has the same
characteristics that caused the previous version to fail: excluded by
constraint '^>=1.7' from 'sauron')
[__3] fail (backjumping, conflict set: base, sauron, time)
After searching the rest of the dependency tree exhaustively, these were the
goals I've had most trouble fulfilling: time, sauron, base, colourista
Try running with --minimize-conflict-set to improve the error message.
```

It's not really clear what's wrong here immediately.

I propose an alternative, a friendlier and probably clear output formatting:

```
abal: [build-plan-error]
Couldn't find a valid build plan that satisfies constraints for all packages

Build plan details:

❌ sauron-0.0.0.0
├── ✅ base-4.16.3.0 (GHC 9.2.4)
├── ✅ colourista-0.1.0.1
└── ❌ time <== Problems satisfying this dependency
├── ❌ time-1.11.1.1 (boot version)
│ └── sauron ==> time ^>= 1.7 (incompatible bounds)
│
├── ❌ time-1.7.0.1
│ └── time ==> base >= 4.7 && < 4.13 (conflicts with: base-4.16.3.0)
│
└── ❌ time (skipping 32 other versions)
└── sauron ==> time ^>= 1.7 (incompatible bounds)

Suggestions to fix the problem:

* Edit bounds for your dependencies
* Try running with '--minimize-conflict-set' to improve the error message
```

This issue is created as a followup from one of the old issues:

* https://github.com/haskell/cabal/issues/2858#issuecomment-1215893572

I'm creating this issue to track this feature request and discuss potential improvements. But currently, I don't have the capacity to implement this feature and push it through.