feat: congestion control for catchunks

[AnoldGH]

Related to #97

Summary
This PR introduces congestion control mechanism for catchunks

Improvements

• Commit 0e215a2 adds a general interface that supports multiple congestion window strategies, including fixed window, AIMD, and CUBIC
• Commit 48afe7c refactors the existing codebase to add a retransmission queue for better congestion control

Pending Changes/Additions

• TryStore as in ac07cca
• Argument parsing for congestion window parameters (need to change Client APIs)

[Copilot]

Pull Request Overview

This PR introduces a congestion control mechanism for catchunks by adding multiple congestion window strategies and integrating a retransmission queue. Key changes include:

• Adding a new RTTEstimator interface for RTT measurement.
• Implementing three congestion window strategies: Fixed, AIMD, and CUBIC.
• Refactoring the client consumer to leverage the new congestion control mechanism with retransmission queue support.

Reviewed Changes

Copilot reviewed 6 out of 6 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
std/object/congestion/rtt_estimator.go	Adds the RTTEstimator interface for RTT estimation.
std/object/congestion/congestion_window_fixed.go	Introduces a fixed congestion window implementation.
std/object/congestion/congestion_window_cubic.go	Implements the CUBIC congestion window strategy with updates.
std/object/congestion/congestion_window_aimd.go	Implements the AIMD congestion control mechanism.
std/object/congestion/congestion_window.go	Provides the generic CongestionWindow interface.
std/object/client_consume_seg.go	Refactors client consumption logic to use congestion control.

[Copilot]

The use of the Abs() method on time.Duration is non-standard as the Go standard library does not provide an Abs() method for time.Duration. Consider implementing a manual absolute value computation to prevent potential issues with negative durations.

Suggested change

	t := time.Since(cw.lastDecrease).Abs().Seconds() // time since last decrease
	duration := time.Since(cw.lastDecrease)
	if duration < 0 {
	duration = -duration
	}
	t := duration.Seconds() // time since last decrease

[zjkmxy]

Wow this is amazing

[AnoldGH]

Abs() was added in go 1.19: https://pkg.go.dev/time#Duration.Abs

It is really cool though, didn't realize copilot has these nice interfaces