KNOX-2974 - Add a new endpoint 'extauthz' similar to pre that accepts HTTP verbs other than GET and if configured ignores additional context path params

[moresandeep]

What changes were proposed in this pull request?

• New endpoint 'auth/api/v1/extauthz' (similar to auth/api/v1/pre) that accepts HTTP verbs other than GET
• If configured ignores additional context path params

e.g.

knox git:(KNOX-2974) curl -X POST -iku guest:guest-password https://localhost:8443/gateway/sandbox/auth/api/v1/extauthz
HTTP/1.1 200 OK
Date: Mon, 30 Oct 2023 11:04:54 GMT
Set-Cookie: KNOXSESSIONID=node01fu988w96ue8n19ot0yixrdt6s7.node0; Path=/gateway/sandbox; Secure; HttpOnly
Expires: Thu, 01 Jan 1970 00:00:00 GMT
Set-Cookie: rememberMe=deleteMe; Path=/gateway/sandbox; Max-Age=0; Expires=Sun, 29-Oct-2023 11:04:54 GMT; SameSite=lax
X-Knox-Actor-ID: guest
Content-Length: 0

knox git:(KNOX-2974) curl -X POST -iku guest:guest-password https://localhost:8443/gateway/sandbox/auth/api/v1/extauthz/xyz
HTTP/1.1 200 OK
Date: Mon, 30 Oct 2023 11:05:28 GMT
Set-Cookie: KNOXSESSIONID=node04574919y5ed372i1cdy8i25h8.node0; Path=/gateway/sandbox; Secure; HttpOnly
Expires: Thu, 01 Jan 1970 00:00:00 GMT
Set-Cookie: rememberMe=deleteMe; Path=/gateway/sandbox; Max-Age=0; Expires=Sun, 29-Oct-2023 11:05:28 GMT; SameSite=lax
X-Knox-Actor-ID: guest
Content-Length: 0

Configuration parameter to enable/disable ignoring extra path (/xyz in previous example) is ignore.additional.path

<service>
	     <role>KNOX-AUTH-SERVICE</role>
	     <param>
	       <name>preauth.auth.header.actor.id.name</name>
	       <value>X-Knox-Actor-ID</value>
	     </param>
	     <param>
	       <name>preauth.auth.header.actor.groups.prefix</name>
	       <value>X-Knox-Actor-Groups</value>
	     </param>
	     <param>
	       <name>ignore.additional.path</name>
	       <value>true</value>
	     </param>
              ......
	</service>

NOTE: this endpoint is based on auth/api/v1/pre so all the option that are supported by auth/api/v1/pre are supported by auth/api/v1/extauthz

How was this patch tested?

This patch was tested locally