Data Race in meilisearch.New()

[zeisss]

Description
In our tests we initialize multiple meilisearch clients concurrently. Running our go tests with -count 5 -race predicatably returns a data race error for meilisearch.New() as it concurrently modifies the default options:

meilisearch-go/meilisearch.go

Lines 19 to 23 in e56172a

	defOpt := defaultMeiliOpt
	for _, opt := range options {
	opt(defOpt)
	}

Expected behavior
meilisearch.New() should be callable concurrently by multiple goroutines in tests.

I think the easiest fix is to copy the defaultOptions instead of using a reference.

Current behavior

WARNING: DATA RACE
Write at 0x000104aeac48 by goroutine 58:
  github.com/gramLabs/stormforge-cloud/pkg/testutil.WithMeilisearch.WithAPIKey.func4()
      /Users/zeisss/go/pkg/mod/github.com/meilisearch/meilisearch-go@v0.31.0/options.go:65 +0x40
  github.com/meilisearch/meilisearch-go.New()
      /Users/zeisss/go/pkg/mod/github.com/meilisearch/meilisearch-go@v0.31.0/meilisearch.go:22 +0x78
  github.com/redacted/my-project/pkg/testutil.WithMeilisearch()
      /Users/zeisss/p/redacted/my-project/pkg/testutil/meilisearch.go:60 +0x54c

Environment (please complete the following information):

• OS: Mac
• meilisearch-go version: v0.31.0