Add support for host_rewrite_header

[davidjumani]

Description

Adds support for the host_rewrite_header route option.
This configures envoy to rewrite the host header with the value of another header based on the value provided
Ref: https://www.envoyproxy.io/docs/envoy/latest/api-v3/config/route/v3/route_components.proto#envoy-v3-api-field-config-route-v3-routeaction-host-rewrite-header

This also fixes a bug where gloo did not reject invalid envoy header keys
vs.yaml

        headerManipulation:
          requestHeadersToAdd:
          - header:
              key: "head(er)"
              value: random

Previously

$ kg apply -f vs.yaml 
virtualservice.gateway.solo.io/default created

$ curl localhost:8080/get
invalid header name: head(er)

Now

$ kg apply -f vs.yaml 

	* Validating *v1.VirtualService failed: validating *v1.VirtualService name:"default" namespace:"gloo-system": 1 error occurred:
	* failed gloo validation resource reports: 2 errors occurred:
	* invalid resource gloo-system.gateway-proxy
	* Route Error: ProcessingError. Reason: *headers.plugin: 'head(er)' is an invalid HTTP header key. Route Name: gloo-system_default-route-0-matcher-0; Route Error: ProcessingError. Reason: *headers.plugin: 'head(er)' is an invalid HTTP header key. Route Name: gloo-system_default-route-0-matcher-0

API changes

• Adds the host_rewrite_header to the route options

Code changes

• Adds support for the host_rewrite_header option in the basic route plugin

CI changes

• N/A

Docs changes

• N/A

Context

solo-io#9579

Interesting decisions

N/A

Testing steps

Unit tests

Checklist:

• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• I have added tests that prove my fix is effective or that my feature works

BOT NOTES:
resolves solo-io#9622

[solo-changelog-bot]

Issues linked to changelog:
solo-io#9579

[github-actions]

Visit the preview URL for this PR (updated for commit 7f5008b):

https://gloo-edge--pr9608-add-host-rewrite-hea-bpwy34fy.web.app

_{(expires Fri, 21 Jun 2024 15:32:09 GMT)}

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[davidjumani]

/kick

[nfuden]

While I would like this to be more robust in the header checking area eventually and would really love a follow up issue but this works for me for now

Edit: i am blind: this does link nicely to the validator in envoy

[sheidkamp]

A couple notes/questions

[solo-changelog-bot]

Issues linked to changelog:
solo-io#9579
solo-io#9622

[davidjumani]

kick bulldozer