feat(geolocation): better handling view zoom/move + show movement direction

[pelord]

Please check if the PR fulfills these requirements

• The commit message follows our guidelines:https://github.com/infra-geo-ouverte/igo2/blob/master/.github/CONTRIBUTING.md#git-commit-guidelines
• Tests for the changes have been added (for bug fixes / features)
• Docs have been added / updated (for bug fixes / features)

What is the current behavior? (You can also link to an open issue here)
1-When geolocation is set to followPosition, the view is updated on each pan.
2-On position change, the activity spinner turn to handle position change.
3- Direction if your location change.

What is the new behavior?
1- When geolocation is set to followPosition, if the feature position is out of view (inside 10% of view inner margin OR outside view) the view will pan to the location, if the feature position is into the view, no action are done.
2- Do not delete the geolocation feature, update geometry instead.
3- show displacement direction

Does this PR introduce a breaking change? (check one with "x")

• Yes
• No

If this PR contains a breaking change, please describe the impact and migration path for existing applications:

Other information: