feat: Adding initial platform helm chart

[mnorbury]

A minimal Helm chart that simply deploys the platform:full and uses external postgres and clickhouse DSNs.

Connectivity is via port-forwarding at this stage (ingress to follow):

NOTES:
The CloudQuery Platform UI can be accessed via port 3000 and the API server via port 4444.

1. Setup port forwarding to access the UI and API servers by doing the following:

   export POD_NAME=$(kubectl get pods --namespace cloudquery -l "app.kubernetes.io/name=platform,app.kubernetes.io/instance=platform" -o jsonpath="{.items[0].metadata.name}")
   kubectl --namespace cloudquery port-forward $POD_NAME 3000 4444

[erezrokah]

Looks good, we can maybe support setting CQAPI_LOCAL_ACTIVATION_KEY which should auto activate the platform.

As a follow up we can add renovate to auto update the via a custom manager https://github.com/cloudquery/.github/blob/87e98d7dc7adbcef3929cefac8972db82b3dbb55/.github/renovate-default.json5#L26