This commit exposes the linters to the python API via the Compiler class. With
this you can now do things like:

```
import yara_x

rule = '''
rule test : a b c {
  meta:
    author = "foo"
  strings:
    $a = "bar"
  condition:
    $a
}'''

c = yara_x.Compiler()
c.allowed_metadata('author', yara_x.MetaType.STRING, regexp='bar')
c.allowed_tags(['a', 'b'], error = True)
```

---------

Co-authored-by: Victor M. Alvarez <vmalvarez@virustotal.com>