Implements a new method http.Request.CookiesName, that allows
retrieving all cookies that match the given name.
Fixes#61472
Change-Id: I405d8771b4195af9ff6b4dfde3cfcd316c23b70c
GitHub-Last-Rev: 6ad0094995
GitHub-Pull-Request: golang/go#61473
Reviewed-on: https://go-review.googlesource.com/c/go/+/511516
Reviewed-by: Emmanuel Odeke <emmanuel@orijtech.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Carlos Amedee <carlos@golang.org>
Reviewed-by: Damien Neil <dneil@google.com>
