[bug] conan.tools.scm.Version cannot be used from conan.tools import

Happens at least in conan 1.51.3 / 1.51.2 / 1.51.1 / 1.50.2 / 1.50.1 / 1.50.0

```
(conan) λ python
Python 3.10.2 (tags/v3.10.2:a58ebcc, Jan 17 2022, 14:12:15) [MSC v.1929 64 bit (AMD64)] on win32
Type "help", "copyright", "credits" or "license" for more information.
>>> from conan import tools
>>> tools.scm.Version("1.2.1")
Traceback (most recent call last):
File "", line 1, in
AttributeError: module 'conan.tools' has no attribute 'scm'
```

The workaround is easy as importing like this works fine:
```
from conan.tools import scm
>>> scm.Version("1.2.1")
1.2.1
>>> from conan.tools.scm import Version
>>> Version("1.2.1")
1.2.1
```

However the `tools.scm.Version` should be possible for anyone to use it