fix: use http1.1 by default

[jimmyjames]

Use HTTP 1.1 by default

Description

Configures the default HttpClient to use HTTP 1.1 by default.

There are issues observed using HTTP 2 with FGA, as observed in #126 and failures related to receiving GOAWAY frames.

This change updates the default configuration to use HTTP 1.1.

It also includes a new constructor for ApiClient, to enable easier configuration for a custom HttpClient. If customers wish to use HTTP 2, with this change they can configure the SDK like the following:

// HttpClient.Builder configured for HTTP 2.0
HttpClient.Builder httpBuilder = HttpClient.newBuilder().version(HttpClient.Version.HTTP_2);

final var apiClient = new ApiClient(httpBuilder);

var fgaClient = new OpenFgaClient(configuration, apiClient);

References

#126

Review Checklist

• I have clicked on "allow edits by maintainers".
• I have added documentation for new/changed functionality in this PR or in a PR to openfga.dev [Provide a link to any relevant PRs in the references section above]
• The correct base branch is being used, if not main
• I have added tests to validate that the change in functionality is working as expected

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 32.86%. Comparing base (44a62f3) to head (e098935).

❌ Your project status has failed because the head coverage (32.86%) is below the target coverage (80.00%). You can increase the head coverage or adjust the target coverage.

Additional details and impacted files

@@             Coverage Diff              @@
##               main     #148      +/-   ##
============================================
+ Coverage     32.78%   32.86%   +0.07%     
- Complexity      973      974       +1     
============================================
  Files           182      182              
  Lines          6872     6880       +8     
  Branches        764      764              
============================================
+ Hits           2253     2261       +8     
  Misses         4512     4512              
  Partials        107      107              

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