[Meilisearch v1.44.0] Add human-formatted sizes and detailed DB sizes in stats

Context

[Meilisearch 1.44.0]https://github.com/meilisearch/meilisearch/releases/tag/v1.44.0) introduces human-formatted sizes and detailed DB sizes in stats.

Objective

Update the corresponding SDK methods:

• Get stats of index
• Get stats of all indexes

Both related API endpoints now accept new query parameters:

• showInternalDatabaseSizes: boolean, optional, defaults to false. When present, the index stat objects in responses of the stat routes now contain an additional internalDatabaseSizes key, whose value is a dictionary of the internal database names and their current size in the index, like in the stats object of a batch.
• sizeFormat: human or raw: optional, defaults to raw. When present and set to human, then all database sizes in responses of the stat routes will be returned as a string containing an appropriate unit (MiB, GiB, etc). When missing or set to raw, then the current behavior of expressing the size in bytes as a number is retained.

The keys in internalDatabaseSizes are subject to change and should not be exposed as a strongly typed object.

Tasks

• Add/update methods to handle interacting with the stats API endpoints
• Add/update test cases for the new/updated methods
• Update .code-samples.meilisearch.yaml to add examples under the following keys: get_index_stats_1 and get_indexes_stats_1. It should match the examples in the documentation.

Start with the existing SDK methods for the “Get stats of index” and “Get stats of all indexes” endpoints, then inspect their related test cases. Add coverage for the showInternalDatabaseSizes and sizeFormat query parameters and the response shapes, including the untyped internalDatabaseSizes map. Update .code-samples.meilisearch.yaml under get_index_stats_1 and get_indexes_stats_1 to match the documentation examples.