Allow creating a new toolchain from an existing one

### Problem you are trying to solve

Currently when you create a new toolchain, it is totally blank and you have to install each component one by one.

### Solution you'd like

It would be nicer if the toolchain could be created by cloning existing toolchain and modifying the components from there.

Something like:
```sh
# Create a custom toolchain called "my-custom-name" with with the same components and version as beta-5

# Option 1
fuelup toolchain new my-custom-name beta-5

# Option 2
fuelup toolchain new --clone beta-5 my-custom-name

# Option 3
fuelup toolchain new --source beta-5 my-custom-name
```

### Notes

_No response_