Add tags to packages/libs/images

[maroshmka]

Following the discussion started on kiwicom slack.

Let's add some tags to all the requirements we're parsing. we can:

• get tags from pypi, github, gitlab etc.
• create some tags automatically - e.g. based on text in docs, usage etc. -> we can use some NLP stuff - e.g. LDA (or I believe there will be some service for it)
• allow some people to manage tags

We can combine all 🔝 3 approaches (that would be most cool), but we can start with first one as it should be the easiest :)

If we have tags, we can allow to search/group by them to answer question like:

1. What lib are we using for serialization?
2. Which async framework should I use to follow company standard?
3. etc.