1688: Remove cross-fetch dependency r=brunoocasali a=flevi29

# Pull Request

## Related issue
Fixes #1658 

## What does this PR do?
- removes `cross-fetch` dependency
- if anyone might need the polyfill they should run it themselves
- there's an interesting discussion [here](w3ctag/polyfills#6 (comment)) about polyfills in libraries; I think, as a lot of people do, that the sane and clean path ahead is to make it the responsibility of the library user to polyfill, even if it's somewhat of a burden

## PR checklist
Please check if your PR fulfills the following requirements:
- [x] Does this PR fix an existing issue, or have you listed the changes applied in the PR description (and why they are needed)?
- [x] Have you read the contributing guidelines?
- [x] Have you made sure that the title is accurate and descriptive of the changes?

Thank you so much for contributing to Meilisearch!


1698: Add `"packageManager"` entry to package.json r=brunoocasali a=flevi29

# Pull Request

## Why?
- [`corepack`](https://nodejs.org/docs/latest-v20.x/api/corepack.html) [started adding this field automatically](nodejs/corepack#413), which can be disabled, but everyone has to do it separately, which is very annoying
- anyhow there's no harm in it, `corepack` recommends it even in the "how to disable" doc https://github.com/nodejs/corepack/blob/main/README.md#environment-variables
  - > it ensures that your project installs are always deterministic (if you use `corepack`)
- this does mean that this field will have to be updated periodically, but this is the recommended way

## PR checklist
Please check if your PR fulfills the following requirements:
- [x] Does this PR fix an existing issue, or have you listed the changes applied in the PR description (and why they are needed)?
- [x] Have you read the contributing guidelines?
- [x] Have you made sure that the title is accurate and descriptive of the changes?

Thank you so much for contributing to Meilisearch!


Co-authored-by: F. Levi <55688616+flevi29@users.noreply.github.com>