IA-2907 New API endpoint for Org Unit Tree

[kemar]

New API endpoint for Org Unit Tree (used by the tree picker in the front-end).

Related elements:

• JIRA ticket : IA-2907

Doc

• Design doc 1 - Management of org units with an unvalidated parent
• Design doc 2

Changes

Changes to the Org Unit Tree API

This PR provides a common endpoint for exploring and searching the Org Unit Tree:

• /api/orgunits/tree/
• /api/orgunits/tree/search/?search=congo&page=2&limit=10

Params are optional:

Old	New	Type	Notes
rootsForUser	removed
parent_id	parent_id	number	If not provided, the root of the tree is returned
N/A	force_full_tree	bool	Force full access to the tree
ignoreEmptyNames	ignore_empty_names	bool	The case is different
defaultVersion	version	integer	Version ID
source	data_source_id	integer	Data Source ID
validation_statuses	validation_status	string	Can be combined
N/A	search	string	Used to search the tree

Changes for DataSource

Allow to customise the tree display with options on DataSource.

This change is reflected in the API.

How to test

Use DRF UI at /api/orgunits/tree/: