Added methods add_documents_in_batches, update_documents_in_batches and their tests

[FlamesRunner]

This pull request adds the following methods:

• add_documents_in_batches(documents, batch_size = 1000, primary_key = nil)
• update_documents_in_batches(documents, batch_size = 1000, primary_key = nil)

The tests for these methods are:

• adds documents in a batch (as a array of documents)
• adds document batches synchronously (as an array of documents)
• updates documents in index in batches
• updates documents synchronously in index in batches (as an array of documents)

They are based on their non-batch methods. There are two linter errors:

lib/meilisearch/index.rb:7:3: C: Metrics/ClassLength: Class has too many lines. [252/226]
  class Index < HTTPRequest ...
  ^^^^^^^^^^^^^^^^^^^^^^^^^
spec/meilisearch/index/documents_spec.rb:3:1: C: Metrics/BlockLength: Block has too many lines. [500/497]
RSpec.describe 'MeiliSearch::Index - Documents' do ...

The linter indicates that there are too many lines for documents_spec.rb (which I was thinking of correcting by adding a new documents_batch_spec.rb, or the less clean way of changing the linter, etc), and that index.rb has too many lines (this one I am less sure of, as there aren't really any other classes that separate methods and since this is my first PR here, I don't want to introduce anything that might break something). I'm unsure, so I'd like to get some feedback on these.

References issue #218.

[FlamesRunner]

Thanks for running integration tests, I'm looking through them now ^

[FlamesRunner]

It appears that when I ran the linter originally, I mistakenly removed the "return" statements, which is why the test failed. Sorry about that!

[curquiza]

Hello @FlamesRunner, thanks for your PR, I will review it as soon as possible. It's not a small one so I need time to read it carefully :)

[CaroFG]

Hi @FlamesRunner! For the linter errors, you can run bundle exec rubocop --auto-gen-config, as explained in the contributing guides. Thank you! 🙏

[curquiza]

Hello again @FlamesRunner

The PR seems good to me 🎉
I cannot merge with your linter issue, you can fix with updating the rubocop_todo.yml. See the contributing guidelines for more information: https://github.com/meilisearch/meilisearch-ruby/blob/main/CONTRIBUTING.md#linter-

[FlamesRunner]

@curquiza Thanks to CaroFG -- I missed that line entirely! It should be fixed now, let me know if any further changes are needed :)

[curquiza]

bors try

[bors]

try

Build succeeded:

• integration-tests (ruby 2.7)
• linter-check
• integration-tests (ruby 3.0)
• integration-tests (ruby 2.6)

[curquiza]

Thanks @FlamesRunner

bors merge

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[bors]

Build succeeded:

• integration-tests (ruby 2.6)
• integration-tests (ruby 2.7)
• integration-tests (ruby 3.0)
• linter-check