Add UDT tag

[lynnporu]

Since MTE XPOS tags are poorly supported in ukrainian UD file, I was advised to use FEATS field in order to hash words by their morphology properties. So, I add this PR which includes UDT (Universal Dependencies Tag) parser class.

This PR relates to this issue: mova-institute/zoloto/issues/277.

UDT format

• 1st letter: universal POS
• (2, 3)n-th letters: property
• (4. 5, 6)n-th letters: value

Example

POS namanicsnomgnneunmsin can be interpreted as:

n
am ani
cs nom
gn neu
nm sim

which is actually means:

{
    "upos": "NOUN",
    "Animacy": "Anim",
    "Case": "Nom",
    "Gender": "Neut",
    "Number": "Sing"
}

[lynnporu]

перейти від MTE-міток до UD-позначення

[iasx]

Oh, great!