Add feature: previous tree and next tree button

Actually, the function of this feature has been finished in the https://github.com/Greenstand/treetracker-web-map-client/tree/master also you can find it in the website online : map.treetracker.org

The goal of this issue is to:
* Migrate this feature to the `core`
* Temporarily add two button (as shown in the picture) and add the logic of clicking these two buttons.
* We will open a new issue when our designer has finished the design of the buttons, and replace the UI with new design.

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Some hints:

- Please read our [readme](https://github.com/Greenstand/treetracker-web-map-core#treetracker-web-map-core) for more information/guide/tutorial.
- Here is [an engineering book](https://greenstand.gitbook.io/engineering/) in Greenstand.
- To know more about our organization, visit our [website](https://greenstand.org).
- If you want to join the slack community (some resources need the community member's permission), please leave your email address.

Read the repository README first, then compare the existing previous-tree and next-tree feature in the linked treetracker-web-map-client repository with this core module. Identify the relevant map entry points and determine how the two temporary buttons should trigger the existing behavior; done means the feature is migrated and both buttons work in the core application.

Written by the indexing model from the issue text.