Added caching to local UI pages

[rutujaac]

Added caching for pebblo-ui directory except pebblo-ui/static directory
Added middleware to redirect non trailing '/' requests to trailing '/' routes.

[shreyas-damle]

@rutujaac When I tried locally with this branch, Local UI is working fine, but APIs are giving errors when app is executed.

INFO:     ::1:63714 - "POST /v1/app/discover HTTP/1.1" 307 Temporary Redirect
INFO:     ::1:63714 - "POST /v1/app/discover/ HTTP/1.1" 405 Method Not Allowed
INFO:     ::1:63715 - "POST /v1/loader/doc HTTP/1.1" 307 Temporary Redirect
INFO:     ::1:63715 - "POST /v1/loader/doc/ HTTP/1.1" 405 Method Not Allowed

We need to solve this problem before going ahead with the solution implemented in this PR.

[sonarqubecloud]

Quality Gate passed

Issues
2 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarCloud