Add labels to indicate Tranco ranking

[ksy36]

To get better insight into site ranking we could add labels based on the Tranco rank of the site globally.

It could be something like:

top-100
top-500
top-1k
top-5k
top-15k
top-50k
top-100k

Tranco doesn't have per country rank, but Alexa does and their API will be available until December. So we could fetch them and this data will be valid for some time. For per country labels it could be similar:
top-100-japan,top-500-uk,top-1k-usa

We should have only one label to avoid confusion. If a site is more important in a given country, than globally, then the country label will be added, and vise versa. Also if it's more important in one country, than in another, the one with more importance will get priority.

For example:
mysite.com is 11000 globally, but 4999 in Canada, then it will get top-5k-canada
someothersite.com is 100 globally, but 15000 in Canada, it will get top-100
mysite.com is 4999 in Canada, but 333 in US, then it will get top-500-us

[ksy36]

After discussion with the team, the conclusion is that it makes sense to add labels for the global rank, but for per country rank we could add text to the issue body instead, to avoid creating a huge amount of labels.