[v1.14] Get documents by ID

[Strift]

This issue follows the changes related to Meilisearch v1.14.0 mega issue.

Description

Update the SDK to allow retrieving documents by ID.

For more context, see the related issue in Meilisearch: https://github.com/meilisearch/meilisearch/issues/5345

Tasks

• [ ] Create/update the method to "get documents" to allow retrieving documents by IDs

For reference, here's how this works in Meilisearch JS SDK:

const documents = await client
  .index('index-name')
  .getDocuments({ ids: [1, 2] });