add doc for logOptions configuration

[jjchambl]

Cilium supports overriding default log options, but the default and allowed values for this configuration are undocumented. This PR attempts to provide a structure and specify the defaults for logging options. I have included the json structure only; cilium also supports key/value pairs, but I don't see how it's possible to have both options in the docs effectively -- potentially one reason they were not included to begin with.

Comments/suggestions welcome. I tried to detail the breadth of options as best I could without getting too granular.

Fixes: #5578

Document Cilium's logOptions and overrides

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[jjchambl]

closing so i can do this right lol