feat(ok_http): shared session

[mertalev]

This PR allows creating a client from a JNI global reference of an existing OkHttpClient. In this way, one can share the same session across an app beyond a single isolate, which is both optimal for performance and centralizes configuration. This is notably much simpler to accomplish with ok_http than with cupertino_http.

I've tested these changes in my app and added it to the conformance test suite. I don't expect behavior to be different from a normal client given that the send implementation is the same.

Based on #1880, which should be merged first to clean up the diff.

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PR Health

Coverage ⚠️

File	Coverage
pkgs/ok_http/example/integration_test/client_test.dart	💔 Not covered
pkgs/ok_http/lib/src/jni/bindings.dart	💔 Not covered
pkgs/ok_http/lib/src/ok_http_client.dart	💔 Not covered
pkgs/ok_http/lib/src/ok_http_web_socket.dart	💔 Not covered

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Breaking changes ✔️

Package	Change	Current Version	New Version	Needed Version	Looking good?
ok_http	Non-Breaking	0.1.0	0.1.1-wip	0.1.1-wip	✔️

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Unused Dependencies ⚠️

Package

Status

ok_http

❗ Show Issues These packages are used outside lib/ but are not dev_dependencies: * flutter_test * http_client_conformance_tests * http_image_provider * integration_test * provider * test * web_socket_conformance_tests These packages are only used outside lib/ and should be downgraded to dev_dependencies: * flutter These packages may be unused, or you may be using assets from these packages: * dart_flutter_team_lints * plugin_platform_interface Failed to update packages.

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Changelog Entry ❗

Package	Changed Files
package:ok_http	pkgs/ok_http/lib/src/jni/bindings.dart pkgs/ok_http/lib/src/ok_http_client.dart pkgs/ok_http/lib/src/ok_http_web_socket.dart pkgs/ok_http/pubspec.yaml

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License Headers ✔️

// Copyright (c) 2026, the Dart project authors. Please see the AUTHORS file
// for details. All rights reserved. Use of this source code is governed by a
// BSD-style license that can be found in the LICENSE file.

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Files
pkgs/http/example/main.dart
pkgs/http_multi_server/test/cert.dart

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API leaks ⚠️

The following packages contain symbols visible in the public API, but not exported by the library. Export these symbols or remove them from your publicly visible API.

Package	Leaked API symbol	Leaking sources
ok_http	PublicKey	jni/bindings.dart::Certificate::getPublicKey jni/bindings.dart::PublicKey::nullableType jni/bindings.dart::PublicKey::type jni/bindings.dart::Certificate::verify::publicKey jni/bindings.dart::Certificate::verify$1::publicKey jni/bindings.dart::Certificate::verify$2::publicKey jni/bindings.dart::X509Certificate::verify2::publicKey
ok_http	$PublicKey	jni/bindings.dart::PublicKey::implementIn::$impl jni/bindings.dart::PublicKey::implement::$impl
ok_http	$PrivateKey	jni/bindings.dart::PrivateKey::implementIn::$impl jni/bindings.dart::PrivateKey::implement::$impl

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