docs: add reverse proxy proposal for enhanced UI extensions (#10435)

* docs: add reverse proxy proposal for enhanced UI extensions

Signed-off-by: Leonardo Luz Almeida <leonardo_almeida@intuit.com>

* add goals and use-case

Signed-off-by: Leonardo Luz Almeida <leonardo_almeida@intuit.com>

* Add CRD example

Signed-off-by: Leonardo Luz Almeida <leonardo_almeida@intuit.com>

* Add goal details

Signed-off-by: Leonardo Luz Almeida <leonardo_almeida@intuit.com>

* Add rbac use-case

Signed-off-by: Leonardo Luz Almeida <leonardo_almeida@intuit.com>

* Add rbac details and examples

Signed-off-by: Leonardo Luz Almeida <leonardo_almeida@intuit.com>

* Add config section

Signed-off-by: Leonardo Luz Almeida <leonardo_almeida@intuit.com>

* Add diagrams to the proposal

Signed-off-by: Leonardo Luz Almeida <leonardo_almeida@intuit.com>

* Add considerations

Signed-off-by: Leonardo Luz Almeida <leonardo_almeida@intuit.com>

* Minor fixes

Signed-off-by: Leonardo Luz Almeida <leonardo_almeida@intuit.com>

* minor fixes

Signed-off-by: Leonardo Luz Almeida <leonardo_almeida@intuit.com>

* add multi backend support to proxy proposal

Signed-off-by: Leonardo Luz Almeida <leonardo_almeida@intuit.com>

* Address review comments + multi-backend details

Signed-off-by: Leonardo Luz Almeida <leonardo_almeida@intuit.com>

* address comments

Signed-off-by: Leonardo Luz Almeida <leonardo_almeida@intuit.com>

* Address review comments

Signed-off-by: Leonardo Luz Almeida <leonardo_almeida@intuit.com>

* Add additional goal for additional security

Signed-off-by: Leonardo Luz Almeida <leonardo_almeida@intuit.com>

* Add RBAC suggestions

Signed-off-by: Leonardo Luz Almeida <leonardo_almeida@intuit.com>

* Minor changes

Signed-off-by: Leonardo Luz Almeida <leonardo_almeida@intuit.com>

* Visual improvement

Signed-off-by: Leonardo Luz Almeida <leonardo_almeida@intuit.com>

Signed-off-by: Leonardo Luz Almeida <leonardo_almeida@intuit.com>