Ported Prometheus/Grafana SLO Demo

[rewsmith]

Ported across from demo-slo-prometheus-grafana. Changes made to avoid port collisions and also modified the directory structure to fall inline with Tyk Demo standards

[sedkis]

@carlostyk - mind having a play with this PR please? I believe you have some experience playing with this stack

[carlostyk]

@sedkis @rewsmith - always ready to help! I am missing something in the bootstrap logs - I would also put the user and password of the Grafana user. To be consistent with the other part of the deployment. What do you think? It is working like a charm!

[rewsmith]

@sedkis @carlostyk @davegarvey Comments addressed and ready for review again

[sedkis]

Tested on m1, works perfect, thx

[davegarvey]

Thanks for this contribution Andy 👍