Search result marker

[cbourget]

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)

• No marker is added

What is the new behavior?

• A marker is added to the map on the focused or selected result.
• The map moves to the focused result but doesn't zoom.
• The map moves and zooms to the selected result.

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

[ ] Yes
[ x ] No