Increase Window Update size

[mosuem]

Instead of sending small window updates, the same size as the DATA length received, send larger updates once a certain portion of the window has been used up, as suggested here.

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[github-actions]

PR Health

Breaking changes ✔️

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Package	Change	Current Version	New Version	Needed Version	Looking good?
http2	None	2.3.1-wip	2.3.1-wip	2.3.1-wip	✔️

Changelog Entry ❗

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Package	Changed Files
package:http2	lib/http2.dart lib/src/flowcontrol/window.dart lib/src/flowcontrol/window_handler.dart lib/src/frames/frames.dart lib/src/hpack/hpack.dart pubspec.yaml

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File	Coverage
lib/http2.dart	💔 Not covered
lib/src/flowcontrol/window.dart	💚 100 %
lib/src/flowcontrol/window_handler.dart	💚 100 %
lib/src/frames/frames.dart	💔 Not covered
lib/src/hpack/hpack.dart	💚 96 %

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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.

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// Copyright (c) 2024, the Dart project authors. Please see the AUTHORS file
// for details. All rights reserved. Use of this source code is governed by a
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test/src/flowcontrol/mocks.mocks.dart

Package publish validation ✔️

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Package	Version	Status
package:http2	2.3.1-wip	WIP (no publish necessary)

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