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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PR Health

Breaking changes :heavy_check_mark:

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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	:heavy_check_mark:

Changelog Entry :exclamation:

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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	:broken_heart: Not covered
lib/src/flowcontrol/window.dart	:green_heart: 100 %
lib/src/flowcontrol/window_handler.dart	:green_heart: 100 %
lib/src/frames/frames.dart	:broken_heart: Not covered
lib/src/hpack/hpack.dart	:green_heart: 96 %

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test/src/flowcontrol/mocks.mocks.dart

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

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