Feature Request: Mark user as bot automatically

[Pablohn26]

GitHub API and GitLab API provide information if an account is a bot or not.

For GitHub, here is an example of a personal account ("type": "User") and a bot account ("type": "Bot")

For GitLab, here is the documentation where you can see the field "bot": false or true

It would be good to check automatically if an account is a bot or not. Sometimes this may not be helpful because for example the GitHub docs bot is not type: bot, but will help in some other cases to avoid manual work.

Note: issue moved from https://github.com/chaoss/grimoirelab-sortinghat/issues/684