feat(plugin/redirect): plugin to redirect requests to a new location

[mheap]

Summary

Adds a new plugin that allows users to return a Location header on a given entity.

This use case can currently be met with the request-termination and exit-transformer plugins, but it's a common workflow that we should support as a first class citizen.

Docs are pending - If this PR is deemed acceptable I can submit a docs PR before merge

Checklist

• The Pull Request has tests
• A changelog file has been created under changelog/unreleased/kong or skip-changelog label added on PR if changelog is unnecessary. README.md
• There is a user-facing docs PR against https://github.com/Kong/docs.konghq.com - PUT DOCS PR HERE

[nowNick]

Looks good to me 🚀 !

It's also an interesting argument towards some sort of plugin piping (combining plugins).

[kikito]

Looks good enough to me, minor cosmetic comment

[kikito]

Suggested change

	"redirect"
	"redirect",

[team-gateway-bot]

Cherry-pick failed for master, because it was unable to cherry-pick the commit(s).

Please cherry-pick the changes locally.

git remote add upstream https://github.com/kong/kong-ee
git fetch upstream master
git worktree add -d .worktree/cherry-pick-13900-to-master-to-upstream upstream/master
cd .worktree/cherry-pick-13900-to-master-to-upstream
git checkout -b cherry-pick-13900-to-master-to-upstream
ancref=$(git merge-base 7d2f2c1354453318b16f73fccd2c9b9cf0a7e7ae 030454704e5f35a96db19e2d64b38ebc65926349)
git cherry-pick -x $ancref..030454704e5f35a96db19e2d64b38ebc65926349