Separate token specific code into its own export

[flevi29]

Pull Request

Related issue

Fixes #1690

What does this PR do?

• generalizes the MeiliSearch client into a single universal export by stripping Node.js crypto specific token code into its own separate exported module
• apiKey option is now mandatory in generateTenantToken function

Migration

Old:

import { MeiliSearch } from "meilisearch";

const client = new MeiliSearch(/* ... */);
const token = await client.generateTenantToken(/* ... */);

// ...

New:

import { generateTenantToken } from "meilisearch/token";

const token = await generateTenantToken(/* ... */);

// ...

PR checklist

Please check if your PR fulfills the following requirements:

• Does this PR fix an existing issue, or have you listed the changes applied in the PR description (and why they are needed)?
• Have you read the contributing guidelines?
• Have you made sure that the title is accurate and descriptive of the changes?

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