Release v1.4.0

[shaneutt]

This is a tracking issue for the v1.4.0 release cycle, and will be closed when the release ships. Subscribe to this to get updates on features that are being scoped into the release, and for other significant progress updates.

Release Manager: @shaneutt (@shane on Kubernetes Slack. Please feel free to PM me about the release)
Scoping: Standard / Experimental
Project Board: Release v1.4.0 (view)
Milestone: https://github.com/kubernetes-sigs/gateway-api/milestone/22

[shaneutt]

Scoping has concluded: #3824

[shaneutt]

📣 Important dates (including code freeze, and final release target) for the v1.4.0 Release have been solidified and can now be found in a table on the v1.4.0 milestone.